Custom/unique profile at specific vertex on layout generator line

I am using the line tool in layout generator to carve roads and rivers into my terrain. However I can only have one profile per line. So all vertices on the line share the same profile.

Is there a way to have a custom profile for a specific vertex? Roads and rivers naturally widen and narrow, become deeper and more shallow and generally change shape as they move along a landscape. It would be great if you could replicate this in World Machine. I know I can add a fractal to break up the shape but doesn’t really give great results and you cannot fine tune a profile at a specific point.