Feature request: option to only sync calendar event time start and time end

It would be great if folks could specify which specific elements of the calendar events they would like to sync. It would be great if I could make a calendar event on a secure calendar, filled with sensitive information, and then see a "blank" calendar event pop up for the same time slot on a much less secure public facing calendar.

I use nextclouds appointment calendar system so people can schedule meetings with me. The app looks through exsisting calendar events to determine which default slots to present to the user who wants to schedual the meeting.

IE, if someone wants to meet with me, they can schedual a meeting where the 1am, 12pm, 1pm. But if I already have a calendar event at 12:30, the 12 and 1 slots wont be availible. This is essential to prevent double booking and conflicts.

The problem is there are many calendars I use which have events / meetings that contain a great deal of sensitive info, info which is too sensitive to be synced to the public nextcloud instance. But to make calendar appointments work, the nextcloud calendar needs to have those slots filled with something. Currently I have to go through and manually add a bunch of blank busy events, despite having a bunch of neat syncing tools like vdirsyncer.

No files or tests are named. Start by locating the calendar event synchronization and configuration entry points, then determine how an option could select only event start and end times while preserving busy slots. Done means a configured sync can omit sensitive event fields and still create usable events for conflict detection.