How can i edit Import values on model that doesn't have it's own file (Maybe Probuilder specific)

So I have a mesh that is created in the editor but I'm unsure where it is stored (I think it's in the scene file?). I need to be able to change the Read/Write value of the model/mesh but the mesh doesn't link to a model import window. (The mesh is created by ProBuilder)

Is there a way to change the Read/Write value of a mesh without the import window?