could someone do this for me please?

[machulnyy]

Hi

Could somebody please change the back edge of this shape to have fading dots?



So that it looks like this:



With the dots more dense/ thicker to the left and right but less dense/ smaller where they meet in the middle behind the front edge.

Also trying to do the same thing with the right two edges of this shape:



So that the dots a bigger/ thicker/ more dense towards the top and bottom and more rare where they meet in the right corner.

I tried it myself, but here's how that turned out for me:


Which isn't right. the whole shape gets done, and the effect isn't quite right.

Thanks in advance!

P.s. please could you provide the source file as would love to see how you did it and play about with it myself.