Notification on event "User added to project"

Hi all, I’m trying to set up notifications when a new user is added to a project.

I can see on the documentation that this should be possible, but I couldn’t find where to set it up.

When I go to https://gitlab.com/profile/notifications the only events I can get notifications for are the issue/epics/merge request events.

Any idea how to do this?
Thanks for your help.