It’s a bit of a pity that the app detects and display VCALENDAR’s in emails, but that there is no way to import them in the calendar 
You sure can do a “Create event”, but it ignores the details of the appointment…
I might miss something, but if the feature is there, it’s well hidden
Those would be requests for Calendar and mail github repos. They will want you to submit the pr yourself.
Yeah, yeah, I know the “PR welcome” drill 
It just “seems” easy for someone knowing the code considering it “seems” all the building block (extracting vcalendar / publishing to calendar) are there…