Adding records to a collection in Collection Discovery automatically adds them to the out-of-the-box Digital Collections facet in main Primo by the Collections title value.
It would be a significant boost to discovery of these resources both individually and collectively in the main Primo environment if there was also a Collection title field available to be added to the full record display, which could be configured as a lateral hypertext link, and searchable by the collection title as keywords.
This would marry together the main Primo environment with the Collection Discovery environment, with the ability to travel between each to find the related content, and taking advantage of options in main Primo such as saving the collection title query as a saved search alert, navigating by the next and previous result arrows through the collection content, filtering by facets such as author or subject, and exporting all the records.

Use case: I am an academic looking to add works by Aboriginal and Torres Strait Islander authors to my teaching materials for my courses. I’d like to be able to search Primo by keywords for my course content as well as the terms like Aboriginal and Torres Strait Islander authors, find a record and open it to review the details, and click on the lateral hypertext link for the Aboriginal and Torres Strait Islander authors collection to find all the content available for review.
Another use case is the same scenario but for academics looking for Open Educational Resources to add to their course content, for many libraries who use Collection Discovery to bring together OER content in their collections.

Note: This is not currently possible to do by a local field as the Collection ID is not available as a bibliographic record data reference to map in the Collection Title to each record PNX. A local field can be used in a very manual way by adding rules for mapping the harvest point for a record and then adding the collection title, but this limits collection content to bibliographic data and does not leverage the ability to manage collections by logical sets using physical titles in location codes and all works with specific Authority IDs.