How to apply Chaos Field System to only one specific actor?

Hi everyone,

I am facing a big problem with a Chaos-based effect that I implemented. Essentially, in order to solve it, I need a way to either apply a field system to only one specific actor or a way to pause the simulation without the use of a field system.
Meta data filters do not work in my situation since I cannot build my filter rules on top of object types for my effect to work.

Any help would be greatly appreciated!

Best regards