Since AE 24.1, you can import .glb files. I was testing some .obj import last month, but it's not working anymore, so I'm confused about the future of these 3D objects. Maybe an Adobe engineer could throw some light at the topic.
GLB and GLTF import is supported in 24.1. OBJ import is still beta-only, coming soon to a release version. Were you having issues in the beta or release?