Managing members in shared mailboxes "responsible person/owner"

Managing members in shared mailboxes "responsible person/owner", as you do with distribution lists

Is there a possibility to manage the members of shared mailboxes from a responsible person/owner of the shard mailbox, as it is possible with distribution lists or M365 Groups?
I have a customer who wants to have the shared mailbox managed by "normal" users without a helpdesk/IT admin with elevated rights having to do it.

What the whant to do:
Delegate Full Access/Send As/Send on behalf of permissions
Only the shared mailbox the are owner of