There is at least https://jmap.io/spec-calendars.html https://jmap.io/spec-calendars.html just adoption is a bit low for now but I hope it will gain more tracti

There is at least https://jmap.io/spec-calendars.html https://jmap.io/spec-calendars.html just adoption is a bit low for now but I hope it will gain more traction the next years.