How to set the zindex for DataSourceCollection and ElementCollection in cesium JS The current effect is that objects in DataSourceCollection are always displayed on top of ElementCollection

CesiumJS
1

I hope the level of ElementCollection can be higher than that of DataSourceCollection

Open the link below

Replace the code inside with my code to reproduce it

const viewer = new Cesium.Viewer("cesiumContainer");

//Example 1: Load with default styling.
Sandcastle.addDefaultToolbarButton("Default styling", async function () {
  const dataSource =await Cesium.GeoJsonDataSource.load("../SampleData/ne_10m_us_states.topojson")
  viewer.dataSources.add(
    dataSource
  );
  // 设置geojson的zindex发现无效
    const entities = dataSource.entities.values;
    for (let i = 0; i < entities.length; i++) { 
    const entity = entities[i]
    entity.polygon.zIndex = 1
    }
  
   

    
  setTimeout(() => {
       const redPolygon = viewer.entities.add({
        name: "Red polygon on surface",
        polygon: {
          hierarchy: Cesium.Cartesian3.fromDegreesArray([
            -115.0, 37.0, -115.0, 32.0, -107.0, 33.0, -102.0, 31.0, -102.0, 35.0,
          ]),
          material: Cesium.Color.RED,
          // 这里设置了zindex发现 entities 任然在dataSource下面显示
          zIndex: 20
        },
      });
   
  }, 1000);
  
  //window.viewer = viewer
  
});