Unique number of Lightbox Images per CMS Item

So I already understand that you can connect CMS Collection items using a single “group name.” This will allow the Lightbox to cycle through multiple images in that CMS collection. But that “isn’t” what I’m hoping to accomplish. I’m looking to give each CMS Collection item its own “unique set” of images to cycle through in a lightbox or similar. And if possible—without using the Multi-image option—since that only works within Template pages? Or… is there any custom code out there that will be able to help. It would seem to be easy enough, just to be able to dynamically set the “group name” to be unique per CMS Collection item—but not seeing any way to do this either.

Thank you for any help you can provide!