SuiteCRM 8.6 Sync Calendar with CalDAV, not Google?

is it possible to sync my SuiteCRM 8.6 calendar to a CalDAV calendar on a different server, not a Google calendar?

If yes, how?

There are quite a few threads on these forums about the same topic.
Including one in the suggestion box: CalDAV, CardDAV support as a client and server - #31 by TheLittleDuke

There is a plugin mentioned - tested with Suite7.
So overall, the 8.6 situation doesn’t look great with CalDav.

If you’re aiming for NextCloud, maybe here are some hints: