Hi V3Ri,
You can do this with a Physical Material applied to the asset and change the density value of it through blueprints. Below I will include some screenshots on how you might set this up (the Event Tick is just for testing purposes).
However, there is a issue with this process at the moment. If using Play-In-Editor or New Editor Window mode, it doesn’t just change the density while playing but changes it permanently in the editor. I have entered this in our tracking software as TTP# 343946 and our developers will be looking into it.
