Setting an author email for a group

we are looking into migrating from bb to gitlab :raised_hands:

The issue I’m currently facing is, that I can’t configure the author e-mail for web-ui edits, based on a group I’m contributing to.
I found the separate setting for notifications, based on group. but there seems to be no option to configure what e-mail is used when committing in the web-ui. It always uses the accounts main e-mail address.

Am I not seeing this, or is this really missing?
thanks for any pointers.