Mapping emClient private event flag to DAV CLASS CONFIDENTIAL

is there a possibility to configure calendar to mapping emClient private event flag to DAV CALSS:CONFIDENTIAL instead of PRIVATE?

The difference is that if the calDAV calendar (nextCloud in our case) is shared with someone, the PRIVATE events are completely hidden in compare to CONFIDENTIAL which only shows availability status (busy, out of office, tentative, …)

Thanks for any hint.
Have a nice day,