While it's possible to use Google sign-in, there's no way to sign out easily using the Google component (see https://forums.expo.io/t/google-sign-out/10845). Someone suggested using a Google API for this in a related forum topic, but it doesn't seem straightforward (several people failed trying this).

In our application, people may log in using a Google account, but may want to log out and in again using a different account. Right now, the only way is to delete and reinstall the application (!!).