Enable groups instead of email addresses for the ackify-ce

[sejo]

When you want to self host, there is no option to do any team management or even use the groups in your upstream oauth solution.
This means for each document you send out one needs to fill in all the email addresses manually or use a CSV file.

This does not scale or is not really useable.

I am not asking this perse to be for free, but provide a self-hosting license model for these features maybe?