We are in the final development stages to develop such a feature for ShapeDiver. You can read more about it here and see a teaser video:
The idea is to expose this functionality through new Grasshopper components, which will expose geometry inputs (points and polylines at first) directly in the online 3d scene and allow them to drive the Grasshopper definitions stored on ShapeDiver.
Once the beta version is released, we are looking forward to exchange with testers and iterate depending on existing use cases. Let me know if you would like to take part in the process!