I didnt try it yet. But Unreal Scans for Collision meshes in the same folder as the import target. You could try too lay Mesh for Collision with the correct ending .UCX ( i guess) in the exact same folder.
Maybe it works. import.glb and import.glb.UCX put in the same folder importing import.glb would be my test if it works.
remember to reduce the number of vertices after the test that it is performant.