Can i control weight paint from nodes procedurally?

Ok so I want to make procedural cookies. I got my noise made in nodes, the grayscale map controls the displacement of a cookie. I want to put some chocolate chips in cavities using particles hair, but i want it to be procedural, not just baking a texture and using it to control the weight.

Can I use output of a material ( or single node) as weight? This and this is 0 to 1 values but i can't find a way to connect them ;_;

Thanks for your time ;)