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Populate a collection list with symbols from library?

I am trying to build a page with a collection list that can be populated with pre-built modules (that are all unique), using the CMS to choose which ones to import into the collection list. I am already doing something similar on a different page by using a multi-reference field to build salesperson bio blocks, but those all have the same structure and only image and text needs to be switched out. In this instance, each of the rectangular light blue blocks has a unique layout and different elements, so I can’t dynamically build them from the CMS. I was hoping I could somehow pre-build all of them, then convert to symbols and use the CMS to choose only a few from a list of all of them, and those symbols would populate the collection field. Any insight appreciated, thanks.

Page I am referring to is the “What’s important to you” tab