Cesium for UE4 + ESRI World Boundaries and Places

I also am trying to incorporate an ArcGIS layer into Cesium for Unreal via ArcGIS REST Services. I see that for the Cesium Terrain Bing Maps Imagery layer, there is a Bing Maps component attached to the Cesium World Terrain instance

and related options in the Details

But there are no components or related options accessible via the blank Cesium 3D Tiles tileset

This post and related pull request seem to show that this functionality is in the repo waiting for review. Cesium, any chance we can get some action on this?

Otherwise, the approach may be to pull the repo ourselves and merge/troubleshoot/add this functionality individually. The CesiumBingMapsRasterOverlay files in the Cesium for Unreal plugin source can be a reference.