Yea that makes sense but Twinmotion will have to implement it.
The reason I spoke of csv files is that Twin has a parser for materials so you can automate materials creation from rhino to Twinmotion instead of doing them manually. I requested that it extend to assets from Twinmotion. Take a look and get back to me if you want to coordinate a request.
Here are the links to Twinmotion support and requests.
Epic Developer Community Forums
Twinmotion 2023.1 Substitution Table Overview | Epic Developer Community
RM