it's possible to add Label above polyline in cesium library?
img: https://i.imgur.com/nLjEE0Q.jpg
Example: https://cesiumjs.org/Cesium/Build/Apps/Sandcastle/?src=Hello%20World.html&label=Showcases&gist=329258ccdd84cb7a541eb246aa0fd8b3
I think this still an open issue in Cesium. So, you have to wait until they make it possible.
https://github.com/AnalyticalGraphicsInc/cesium/issues/53
https://github.com/AnalyticalGraphicsInc/cesium/issues/4108