Configuration of Albums within Gallery?

I just successfully installed Nextcloud. I would like upload a collection of photos & videos that are already arranged in albums.

I am been looking over the documentation on how to script the gallery.cnf file to take advantage of the new feature - to have multiple albums within one gallery.cnf file.
I can’t find any examples, and the YAML documentation doesn’t address it.

Any help out there would be appreciated. Thank you in advance.