Is it possible to render a label on the surface of globe? If you add an Entity with no height definition or perPositionHeight option, surface of globe will highlighted. But how to add a label at a good position for this polygon? On surface would be nice, but as far as I can see this could be already part on current roadmap for this year:
I’m not sure I entirely understand what your goal is here. Could you provide an image maybe? If you want to make your label part of the globe imagery, you can create a custom ImageryProvider that adds the label to an HTML canvas, and add that to the globe as an imagery layer.