In the Proton Docs app, enable users to add docs to collections. A collection ...

(1) ... provides a list view of all its docs (irrespective of their actual location within the Drive folder structure), and
(2) ... can be opened and edited in a single browser tab, e.g. by displaying each doc as a page (creating something like a notebook).

Use case:

I maintain individual 'Overview' documents for topics such as: bank accounts, various insurances, summer holiday each year, etc.

Obviously, these documents are in separate folders within Proton Drive (alongside related materials like invoices).

Now, I’d like the ability to group these overview documents thematically for easier browsing, comparing and editing.

(Optional)
Let Lumo answer questions based on the content within such a collection.