Hi Robert,
The animations are reading live data and rendering them - so it's not a simple format, but can be represented by gltf well: the mesh models are static, but can appear and disappear and can have arbitrary transformations applied to them.
My vision is an exporter that exports each unique Geode exactly once, and everything else in the scenegraph exported each frame. That would work well for a wide range of OSG-based applications, it seems, and GLTF seems well-suited for this.