Assume credentials (not the actual login password mind you, but things like tokens, cookies, etc) get stolen from one place such as computer at home. It would be nice to see related accesses to Proton services using those credentials.
In other words, a collection of IPs where the credentials have been used. This may not add much for those who log in on mobile devices due to roaming, but would certainly be helpful for desktop computers which usually do not change their public facing IP.

This should equally apply for VPN access tokens as one often does not log out of said service.

Bonus point if additional data is provided such as "this IP is a Proton VPN IP from Berlin" or something like that.

I'm aware this may violate some non-logging policy, but maybe could be opt-in?

Thanks in advance.