Syncing a calendar that requires logging into Google

I have several Google calendars that IĀ“ve successfully synced in my Nextcloud using the .ics private link. However, I am currently trying to sync a group calendar that does not offer this type of link.

I know Thunderbird has a provider extension to sync these calendars, and was wondering if thereĀ“s any workaround for these in Nextcloud as well. Is this possible at all?