More Granular Calendar Event Filtering in the Today View

In the Today view, it should be possible to selectively hide or show calendar events based on specific calendars.

Currently, there is only a single "Show Calendar Events" option, which toggles all calendar events on or off. The only workaround is to hide unwanted calendars in Settings > Calendar, but this also prevents those calendars from being visible in the Calendar view, which is not always desirable.