MAYA: V-Ray - Bake Shadows With Alpha

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So I've been trying to figure this out for a little while now, and I can't seem to find a tutorial on how to do it, so I've decided to come here to see if anyone could help me figure this out.

I use V-Ray in Maya to bake Ambient Occlusion maps, using the V-Ray Light and Dirt shaders. I can bake out proper white and black shadow maps, and use multiply in PS over a texture, but that's not what I'm attempting to do right now. I want to bake out the shadows ONTO an alpha only, no white at all.

This video shows exactly what I'm looking to do, but it's in Blender and I would rather keep my workflow inside of Maya.

Pic unrelated