Voronoi on a 2D subD?

Hi I am new to Rhino. How can I make Voronoi on this SubD?
Subd To Surface.3dm (2.4 MB)

I want it to look like this


None of the tutorials show how to convert subd to surface properly. Maybe I am missing something.

This is how much I could learn through tutorials. But surface morph of GH cant be plugged to a Subd. Please help.
PS: I don’t want to change it to nurbs as it creates a poly surface.
VORONOI first trial.gh (8.9 KB)