Setting up a brim/raft for only a portion of the overall print
In the newest version of Cura (4.5.0), in the per model settings, the only thing you can change for options set Build Plate Adhesion is Brim Distance. What this allows you to do however is create a brim for everything with the distance of a millimeter or two, and then for the part that needs the brim, you just set the distance to zero in the individual part settings. It's a little janky, but you essentially create a skirt for the parts that don't need a brim.