Volumetric heatmap on actors based on data from raycasts

Hey Guys

I am quite new to UE and wanted to ask for some help.
I currently am createing a driving simulator with VR. The idea is to log all the information of the player. So location of the vehicle, rotation of the camera and hitpoints (coming from raycast on objects). With the logged data, I want to highlight the positions the users look at the most. So with the help of the hitpoint locations, I’d like to apply a heatmap onto actors; maybe somehow during postprocessing?
The logging is already working so I just need some hints on how to apply these hitpoints.

Thank you in advance!