Cannot style 3d tile point cloud that are loaded using czml

I used CZML 3D Tiles, as I needed to visualize time dynamic 3dtile point clouds throughout the day. The visualization is working and is smooth.
In addition, I need to style the point clouds, say to some arbitrary color (using some property of the 3dtiles). However, cannot even style the point cloud to a single color.

const czml = [
  {
    id: "document",
    version: "1.0",
  },
  {
    id: "first",
    name: "radar_data",
    tileset: {
      uri:
        "..url/to/tileset.json",
    },
  },
 {
    id: "second",
    name: "radar_data",
    tileset: {
      uri:
        "..url/to/tileset.json",
    },
  },
];

const viewer = new Cesium.Viewer("cesiumContainer", {
  shouldAnimate: true,
});

const dataSourcePromise = viewer.dataSources.add(
  Cesium.CzmlDataSource.load(czml)
);

Sample Output: