Light Probes for .glbs

Is it possible to import a light probe or environment for a .glb file. I think that this would be an essential feature. The ability to import a light probe or enviromental sphereical or cube map that the model could respond to would be great. If it isn't already implemented - please consider this.

An example of what I'm talking about can be seen here: https://gltf-viewer.donmccurdy.com/

1) drag in a .glb

2) Toggle the lighting switch

3) Change the environment to Venice Sunset

My request is to be able to import my own environment.