Adding NC calendars to the desktop version of google calendar

Evening All. ive searched the forms, the web, and im having a dickens of a time finding out how to add my NC calendars to my google calendar via the website.
im running Unraid with Letsencrypt and nextcloud dockers…both current versions. the NC calendar, im assuming, is the latest version too.

ive come across a small amount of forms that apparently say theyve accomplished this, but im not able to really follow their bouncing ball “how to”.

would someone be able to direct me to the proper URL that i should be providing google calendar to share a calendar, please?

appreciate your time reading this.