Hi,
Have you figured out a solution yet? I'm having the same problem and I asked the question here: https://stackoverflow.com/questions/64360323/openmesh-storing-a-vector-on-a-...
I *think* it shouldn't be out of reach to implement it as per here: https://www.graphics.rwth-aachen.de/media/openmesh_static/Documentations/Ope...
but would be easier if someone already had it. Thanks, Botond