Thanks for the request. Currently there is a way to set this property through powershell for groups, but it only works for users in OWA. We have this in our plans for Outlook desktop as well and will be working on it.
An error occurred while saving the commentSelina White commented
I encouraged a group of people to use an Office 365 group for the calendar. They wanted to lock down who can edit the calendar. I did not know you could not assign calendar permissions.