I’m able to create the pydeck chart I need combining a terrain layer and a geoJSON layer. As part of the geoJSON spec, they are 2D files, which means they are placed under the 3D terrain layer.
The deck.gl team has developed a solution to this via extensions (see TerrainExtension (Experimental) | deck.gl).
Best I can tell, these are not accessible via pydeck. Is that the case or is it possible to use these deck.gl features in Streamlit?