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Please provide the following information:

• Please describe the feature you would like to see (it would be helpful if you could add any necessary screenshots, ics strings, etc)

As a iCloud user, I would be quite keen to see if the app can support log-in required calendars in the future, so I don't have to share my calendar publically to sync into google.

The log-in function, in specific, can allow syncing when you trying to use this randomly generated psudo icloud CalDAV link:
https://p01-caldav.icloud.com/0000000000/calendars/