Starting this season Dorna seems to provide an official ICS file for the calendar. It’s available here.
Direct link to the ICS file here.
P.S: In case they don’t update it I’ll create it like previous years.
ICS files extracted from https://www.worldsbk.com/en/calendar
All sessions
Superpole + Races Only
Races Only
Prevoius years calendars available as archive here: