Is it possible to render on pure white or capture a shadow on its own stencil layer?

Hi, I do product renders for several shoe companies, and we’ve moved rendering from Vray to Unreal. One of the problems I’m running into is the need to render on pure white, similar to how rendering engines like Vray or Mental Ray are able to do. (this is for color correction, client wants the shoe on a 243, 243, 243 background) Failing that, is there a way to do a Vray style shadow catcher? (basically a plane that doesn’t render, and is only there to catch the shadow.) I’m using stencil layers, but I can’t seem to get the shadow to separate out into its own layer. I’ve tried composure, but that doesn’t seem to work with the rendering pipleline in the way that I had hoped. Currently, I have to take the finished renders into photoshop and do a curves adjust to isolate the shadow to get it on its own layer, but this is squishing out color information and I’m hoping there’s a better way to handle this.

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Hey, did you come up with any solution?