Remove collider from transparent areas

I have a plane with a “transparent/cutout” metarial on it.
My question is, how can I transform the collider so the transparent areas are avoided?

(1 picture is 1000 words)
83996-collider.jpg

If your world is 2D, then what you can do is use Polygon Collider. In polygon collider you have an option to Edit. (Name: “Edit Collider”) then you can edit the vertexes as per your requirements.