Scale individual point for spline mesh?

I’m using the Procedural Nature Pack system from the marketplace, but I’m sure this is for all spline meshes, but is there any way to implement a way to scale a point of a spline to scale the radius of the mesh at that point?

hmm i suppose i could make a material that adds world position offset to the mesh based on vertex painting, but i cant figure out how the world position offset works. is it just a heightmap, or a normal map? it looks like it takes a normal map, but there’s nothing i can find about what texture channel affects which direction. any help?