Option to define calendar views per open tab

[feedhopper]

I would love to have more than one instance of full calendar, as stated in this FR:
#194

Adding to that: I would love to define what calendard data will be displayed there.
Background info: I use Nextcloud to deal with multiple calendars in one account, so adding this remote source will import all of them. It would be great to filter them inside the calendar-window. As far I understand the plugin, this is only possible by removing one of these calendars globally in options...