I can’t believe this is a tech forum. The answer is simple. 2FA has a url. All you have to do is store the url in your password manager. Then you can import it into any new app at a moment’s notice (as long as you have access to the vault) and generate a 2fa code.

In fact, KeePassium on iOS works on this concept. I use it as my primary otp url storage app and then put limited stuff into aegis on my android tablet for anything I may need there. If a keepass based app with an otp generator (like KeePassium) existed for android, I wouldn’t even need that.