1. A concise explanation of the problem you're experiencing.
ESRI with Arcgis Pro 2.0 allows to publish what they call - a Vector Tile.
you can read about it over here: https://blogs.esri.com/esri/arcgis/2017/08/24/fast-display-of-beautiful-symbology-in-arcgis-online/
does Cesium knows how to handle that?
2. A minimal code example. If you've found a bug, this helps us reproduce and repair it.
3. Context. Why do you need to do this? We might know a better way to accomplish your goal.
4. The Cesium version you're using, your operating system and browser.