Hi @swayoftheverses
I’m not sure I understand your query, so please forgive me if I’m wrong.
I believe you should be able to do it. This page should give you more idea about it: https://www.advancedcustomfields.com/resources/dynamically-populate-a-select-fields-choices/. But instead of getting the choices from a text area, you need to populate it from the custom post types.
That being said, I suggest you use the post object field instead. This field will allow you to select the post object (custom post type) and create a relationship with it. This page should give you more idea about it: https://www.advancedcustomfields.com/resources/post-object/.
I hope this helps 🙂
