A proposed specification to support Hybrid Key Exchange for TLS 1.3 (https://datatracker.ietf.org/doc/draft-ietf-tls-hybrid-design) is currently in development. The current draft of the specification combines traditional x25519, secp256r1 and secp384r1 key shares with kyber512 and kyber768, and KEMs as inputs into the TLS 1.3 key scheduler. Kyber and KEM support (the latter already having been delivered) will be required features in order to implement this feature.