Export to JSON that contains an animated GLB?

Is it possible to export to a JSON file that contains an animation with a GLB file?
I import a GLB file, create an animation, and want to export it in JSON format. I installed Extensions LottieFiles and Bodymovin, but when exporting to JSON, it shows only an empty file. Is it possible that I'm doing something wrong, or is it just that the JSON format doesn't support 3D objects?