Particle System Mask adjust Particle Size

Hello,

I was wondering if there is a possibility to adjust the size of a given particle based on the gray-scale value at that position in a given mask? If so, any hints on how to do that would be awesome!

And I should probably not loop over every single Particle for that as that would kill runtime with ~10k particles?

If the effect is possible in VFX Graph I would not mind swapping over to that if anyone has a good resource for that then! :D

Thanks!