I have a custom domain for ProtonMail and would like to use it to create my own aliases in Proton Pass.
I do not want to configure another service (SimpleLogin) for this purpose !

Replace the "Alias" functionality in Proton Pass by SimpleLogin. That's it.

Do we have any ETA on when this planned feature will be released?

If you setup your own domain and configure SimpleLogin to use it, and then go into Proton Pass and create an alias, it does then create it in SimpleLogin already. However if you add a comment when creating the alias, that stays in Proton Pass and not reflected in SimpleLogin. It just states 'Created with Proton Pass' when you go look at the alias in SimpleLogin. Editing the comment in one should update the comment in the other, at a basic level. And for those who already had SimpleLogin with aliases, who then come to use Proton Pass should be able to have those aliases come into Proton Pass so they can see them and manage them there also. Looks like there are plans afoot for more integration though so fingers crossed.

It is confusing to have both SimpleLogin and Proton Pass with their separate browser extensions jumping forward at different web pages and different situations, I want only Proton Pass to keep things simple so it would be great if could merge SimpleLogin into ProtonPass or to be able import aliases and passwords from SimpleLogin into ProtonPass. "Connecting" SimpleLogin and Proton Pass stlll presents me with two different accounts to check and does not help to keep things simple.

It is easy: just bring the full simplelogin inside proton pass. That's it. This would simplify everything for users of both and also would get rid of the "aliases" together with the logins and put them in a separate, dedicated management tab for aliases.

But of course also keep simplelogin for people not using proton pass.

Moreover, it would be appropriate to synchronize the "Alias description" field in SimpleLogin with the "Notes" field in Proton Pass.

I really want to migrate to protonpass entirely, but have 300+ aliases in SL i want to move.

Exporting Proton Pass includes aliases, removing vault and importing does not restore aliases. Yet SimpleLogin is listing the aliases. So this should be improved.

+1
Also for me, SimpleLogin should be retired since I am a 100% Proton user and I would like to get rid of the SL interface and be able to use my own domain to create aliases directly in the ProtonPass interface.

BUT I also understand that you can keep SL working "as is" for everybody that do not want to register for a proton account in order not to take them this service away.

Please keep SimpleLogin alive as it is. Today SimpleLogin has so many more features in regards of alias services that is unmatched by Proton Pass. And I don't want to miss SimpleLogin anymore as a long time user of it.
And not every alias I use is associated with something I would store in a password manager. This would only mess up my password manager I would like to still have these two services separated.
Maybe integrate them better into each other as an opt-in for those who desire it. Maybe add an option to make SimpleLogin the default alias engine in Proton Pass.

But please keep SimpleLogin as a dedicated service as it is.

As I said in desktop app request I don't want to access my logins neither e-mail aliases through web browser. This is a crucial thing that needs to be implemented before I migrate.

I'm playing with migrating from KeePassXC and SimpleLogin to only Pass. From my experimenting today what I'd like to see is Pass:
-integrate existing alias emails (from SimpleLogin)
-have an easy click through to get into the SimpleLogin dashboard (IOT set default domain and manage my aliases, for example)
-integrate a "send from alias" function (i.e., you click that button and it opens up ProtonMail with the "to" line already having the appropriate email address so the recipient sees your alias email)
-better on-website password generation options (I can change length, character type[s], and words or random but the controls are much less robust than KeePassXC)
-extension support for generating a random username (in addition to alias email and password generation)
-app/extension support for storing a username separately from the email (rn it's one or the other, whichever you choose is remembered and the other would have to go in notes)

this feature should have been on the MVP plan. And I mostly agree with @baz, if aliasing is in ProtonPass, then retire SL.

ProtonPass should also include random generators for username (https://protonmail.uservoice.com/forums/953584-proton-pass/suggestions/47027815-username-generator) and name, and address (https://protonmail.uservoice.com/forums/953584-proton-pass/suggestions/47410232-random-name-first-last-and-address-generator)

Not sure if this belongs in Pass or Email, or both: https://protonmail.uservoice.com/forums/284483-proton-mail/suggestions/47763086-sync-labels-between-proton-mail-and-simplelogin

SimpleLogin should be retired at this point and syncing the data and the whole feature set / business of SimpleLogin into ProtonPass, So we can uninstall and get rid of SimpleLogin and just use ProtonPass to manage everything.

@Kristian Dimoski: true, I just noticed yesterday that SimpleLogin aliasses that are created in Proton Pass are added to SimpleLogin.

The most important thing missing is to transfer the SimpleLogin aliasses made in SimpleLogin to Proton Pass. Or make those automatically sync. It would be nice to have access to all aliasses from both sides or, as Drew suggested, transfer all aliasses completely and manage them only in Proton Pass. In this last instance, it would be nice to have all SimpleLogin features when managing aliasses in Proton Pass. Such as viewing amount of forwarded mails, etc.

it kinda does for me, whelp the proton pass to simple login bit, I just have simple login enabled with login with proton (if you don't have it enabled yet, login to SL > settings > connect with proton). than when I sign up for a website it pops up asking if i wanna use an alias and it uses my website.

SimpleLogin offers Alias Export.
Proton Pass can store / link Alias to their Logins.

It would be nice if the Proton Pass Import would support importing Data directly from SimpleLogin so the previously created, existing Alias are also shown for their websites.
When migrating to ProtonPass while having used SimpleLogin and another Password Manager previously for example.

@Drew: true, that would be a great addition as well, to just switch completely. If that's easier to implement by the Proton team, it would also be greatly appreciated.

Edit: so please view this suggestion as this implementation as well. I can't edit the feature request itself to include this implementation, but it definitely should :)

Came here to post this but found it already posted. I don't even need them to stay in sync, I'd be happy if I could just import my SimpleLogin aliases into Pass and be done. Since I can create and manage aliases directly in Pass, I could really remove the SL extension and do everything in Pass after I import.