Pointcloud is an important update in Rhino8 gh, and currently it seems that Hops cannot be used to directly transfer pointcloud data.(like <rhino3dm._rhino3dm.PointCloud object at 0x000001FB20E5D830>)
Thanks!
We are working to add support to all of the new datatypes that were added in Rhino 8 into Rhino.Compute/Hops. We have made a lot of progress here (internally) towards this and hope to release something very soon.