Universal Scene Descriptor. Here’s the UE docs - Universal Scene Description (USD) | Unreal Engine Documentation
I export USD from Blender 3.2.2 - I don’t know how far back in Blender versions it’s supported.
Another way that I use to import scenes is to export GLTF from Blender and then use Datasmith CAD importer to import the .glb file.
Good Luck!