Bitgapps microG flavour. There are better installers. They are all indepndent of android version.I found it on settings - accounts - Google when using MicroG, about the version i used, i used the one for android 9 from here
Custom microG Package From BiTGApps.Builds For Android Platform ARM.www.pling.com
I don't have that MicroG anymore but i can translate it to you:
Let external apps to find your Google Accounts
When enabled, all apps on this device will be able to see your Google Accounts email address without prior authorization
MicroG suppots only one Google account. But runs well without account.