Google Integration Data Migration tool

I have a working link from my google account to my nextcloud account. Great. Now what about linking my wife’s google account to her nextcloud account, my sister google account? any other google account or It look fantastic the one time google migration tool but being connected to Client ID and Client Secret form Google API, developers should have think a way to manage more then one user or, a simple place in which store Clint ID and Client Secret of the Google API so “easily” we can change manually those 2 data and do that for how many users we have. Some working around? Thanks all