Vertex colors in ABC file from houdini for ID bake

I'm attempting to write out an alembic file from houdini with valid vertex colors I can use to bake the ID map. Is this possible? I've used FBX in the past to do this, but the FBX files that I write from houdini don't preserve the material groups or the mesh paths.

It would be super amazing to have some documentation that spells out the features of each file format that can be imported and how to configure the data that Substance Painter is expecting from each one. Searching the documentation and the interent doesn't provide much info.