Can you paint Layer Materials with landscape splines?

I’m messing around with landscapes and have created some materials that seem to be working well. However,I’d like my river spline to also paint one of my layer materials that I have for the river bottom beneath it. Is there a way to do that? Currently my spline makes the river and the terrain goes up & down based on the spline. However I can’t figure out how to have it also paint a chosen layer material.

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Get a ref to the landscape, then ApplySpline node.