Invite system for groupchats

Apologies if something similar has been suggested before, but it would be nice to have a toggle system for being added to groupchats such as:

Open: Any friend can add you to a groupchat anytime (currently what it is right now)

Request: Friends can send you a request to join a groupchat which can be accepted or declined, similar to the friends request system

Closed: No one can add you/request you to a groupchat

This would be useful for when you would like to have some time to distance yourself and not have to deal with friends adding you to groupchats against your will, and you wouldn't have to unfriend them to prevent them from adding you.