What is the role of the group "qubes" in the default debian-11 template?

I know in debian certain groups can do certain things. For example plugdev group members can mount usb drives. In that sense, what capabilities are granted to the user accounts that belong to the “qubes” group in debian-11?

I know for sure it is needed for updating user user (or whatever name given) has to belong to this group. Also, probably for installing (qubes-related?) packages…