Nomad vertex color to octane IOS and Unity

I would like to export my Nomad scene to Unity and Octane IOS with vertex colors for lookdev purposes. Unfortunately both don’t seem to display vertex colors and I assume it’s maybe because Nomad doesn’t assign names to vertex colors?
I could be wrong though.

Other renderers/apps can read it, so it appears to be standard way of storing colour in obj. Octane implies it can read it.

I asked on the octane forum, then got blocked. shrug