How to set default categories for calendar events

The calendar app already has some preset, default categories when creating an event. Business, Education, Holiday, etc. I’d like to change these to some default categories that are more relevant to our needs.

There doesn’t seem to be anyway to do this from inside Nextcloud. I played around with the occ command a little, and was unable to find it there. I also went poking around the database, and I’m not finding these categories in there either.

Does anyone have any suggestions?