Polyline color change HERE maps

Question

I am trying to change the color of the roads by pulling the properties from base map and for water or landuse.park the "polygons.color" works perfectly fine but when I try to do roads which are polylines, I get an error of undefined reading "color". I did try to change "polygons.color" to "polylines.color" but still the same error.

const parkConfig = parkStyle.extractConfig(['roads.highway'], true, true);

parkConfig.layers.roads.highway.polygons.color = '#2ba815';