Feature Request: Timeout

I've got a feature request: I'd love a feature that allows me to lock my entire phone for a set amount of time. I imagine setting it up once, selecting a few apps that I'll have access to during the Timeout, and then there's a simple way (like a button on the home screen, or when I try to start an app with a timer or something) to start a Timeout. It lets me select how long my Timeout should be (30 minutes, 1 hour, 3 hours, custom; similar to how I choose how long to use an app for) and then it blocks all apps that aren't on the allow list for that period of time. Apps I personally would like to allow are things like SMS/Calling, Messengers, AAC, weather, maps, and home assistant.

Inspiration for this is the Fairphone Moments, but it just ends with me turning that back off because there's no timer that prevents me from doing that.

I believe that most of the functionality is already there, given that I can block apps for a set amount of time. I'd just like a UI to start a predefined blocking routine for a selectable amount of time.

If there is a different place to enter feature requests, do let me know.