How to change the background to green chroma key in mixamo 3d viewer ??

Agree, it would be convenient if in the 3D preview of mixamo there was an opportunity to change the background to green.

Maybe there is some way? For example, through the source code of the site element. Does anyone know a quick way to make a green chroma key animation? Preferably without unloading into a blender and similar programs. (Inside the mixamo website)

??????