Substitution for direct application of gradients to a "BoxHandleAdornment"?

My goal was to be able to see the part through walls (I already made it work with “BoxHandleAdornment”).

After that, I would like to make the scan look like a heatmap effect or just a gradient (like in Valorant).

I know it’s not possible to apply a gradient to “BoxHandleAdornment”, but maybe there’s another solution for this?