I just tested writing a python script for GH to hatch a curve.
import Rhino
if (curve and curve.IsClosed and curve.IsPlanar()):
hatches = Rhino.Geometry.Hatch.Create(curve, 0, 0, 1)
This script does create hatch geometry, but there is no preview in GH. I don’t think GH currently supports hatch geometry, but I could be mistaken. @DavidRutten is this correct?