2D Grayboxing Tool?

I'm currently trying to find an efficient way to prototype 2D levels. My game isn't based off of a grid so Tilemaps don't work, and I want a way to create a collider for the level that is also rendered in game as the same shape as the collider. I tried using a polygon collider but I'm not sure how to get that to render as a solid object, and it doesn't seem like a particularly efficient way to make levels. Are there any tools similar to probuilder or another grayboxing tool that work with 2D colliders?