https://datatracker.ietf.org/doc/html/draft-irtf-cfrg-concrete-hybrid-kems-02

MLKEM768-X25519 is identical to the existing XWing export ✅

MLKEM1024-P384 and MLKEM768-P256 IIUC cannot be constructed from the @noble/post-quantum/hybrid.js, the delta from the way the XWing export is constructed (aside from labels) is

• that it'd need public keys uncompressed, the ecdhKem export is using compressed ec key representation
• that it's RandomScalar is implemented using rejection sampling from a seed

Test vectors: https://github.com/cfrg/draft-irtf-cfrg-concrete-hybrid-kems/blob/main/test-vectors.json