CMS List should output two collections with categorie and isotope

Hey Guys,

I have to create two collections a and b, because a have different fields and look then b. Now I have a third collection with categories, which will reference in a and b.

So and now I will output one list, the categorie collection, because I will make it sortable with isotope. The problem is, if I target the category collection as output in the cms collection list module, then I can´t choose properties to display out of collection a or b.

Edit: Here is a little visual what I´m trying to achieve.