(Not-manually) schedule tasks or deck cards into calendar?

Does anybody have a working solution (besides manually doing it) for scheduling tasks or deck cards into the calendar?

I’ve been trying to improve my time management for a while but my main problem is that my task list (or deck board) is full but my calendar empty. Scheduling all tasks manually into my calendar is just a huge time eater with the current UI and I don’t want to share my task list or boards with others because they anyway probably won’t look at it.

The only thing I have found with Google is SkedPal, which is a closed ecosystem and cloud-only, so it doesn’t work at all.

I have opened a feature request a while ago ([Feature] [Meta-issue] Scheduling component · Issue #33248 · nextcloud/server · GitHub) but that hasn’t even been triaged yet, so I guess I need another solution.