Apparently there it's possible to required v2 directly. If so then should default back to `<a-gltf-model>` cf `GLTF2` in https://developers.google.com/poly/reference/api/rest/v1/assets#Asset.Format
Apparently there it's possible to required v2 directly. If so then should default back to
<a-gltf-model>cfGLTF2in https://developers.google.com/poly/reference/api/rest/v1/assets#Asset.Format