"Restrict users to only share with users in their groups" is too restrictive

Is your feature request related to a problem? Please describe.
Nextcloud 15 has the setting
"Admin -> Settings -> Sharing -> [x] Restrict users to only share with users in their groups"

This setting makes sense because it "isolates" different user groups in some ways, and doesn't allow users of group1 to accidentally find users of group2, that's perfect.

For me as admin or for other users that are admin of groups they are not member of, it makes it impossible to share - but I would need such feature

Describe the solution you'd like
If the described restriction is in place, I would like to see sharing being restricted to "users in their groups and groups they are admin for"

Describe alternatives you've considered
Make myself a user of the groups I want to share with - but that doesn't make sense.
E.g. I organize an event and have group "organizers" and group "participants".
I'm an organizer, I'm in group "organizers" (with shared write access) and want to share some content with the participants group (read access) that I'm group admin of. Technically I'm organizer, not participant, so I don't want to join the participants group.

Other example: I have some bot accounts that I want to share content with. I am not a bot (but admin of the bot groups), so I don't want to join the bot groups.

Additional context
-/-

No file, test, or entry point is named. Start by locating the setting that restricts sharing to users in the sharer's groups, then trace how group-admin status is checked. Done means group administrators can share with users in groups they administer without joining those groups, while the existing restriction remains for other users.