How do I attach a Balloon to a "non-geometry" part?

I insert non-geometry parts in my assemblies, such as glue, sealant and rivets, so that they will show up in my BOM. Sometimes I want a Balloon to show a non-geomety part, such as using a Stacked Balloon pointing to a geometry part (such as a nutplate) along with a balloon in the stack pointing out the attaching rivets, which are NOT geometry.

I know I can just put Text in the balloon for the non-geometry part, but that's not parametric.

Is there a trick I can use to make a Balloon "see" something that's not really there?

Thanks,

Steve R.

SolidworksDrawings And Detailing