Share Calendar over Federated-Cloud-ID

Is it possible to share a calendar with another Nextcloud-user on a different domain by Federated cloud ID with NEXTCLOUD 11.x?
I have tried already Google and this forum but have not found a concrete answer.
To share a calendar is the wrong way (via link), the other user may not edit this calendar.

With file sharing, it works very well, is this possible with the calendar?
Or is it considered for a later version?

It’s currently scheduled for Nextcloud 13