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Combined Classic McEliece 6960-119 and X25519 public keys are used for KEM purposes, so should have "kem" key usage set.
Its algorithm identifier is mceliece6960119-x25519. Its
public key value is a concatenation of 1047319-byte
mceliece6960119 public key and 32-byte X25519 one.
Public key’s fingerprint should be calculated using SHAKE128.
X2559 is key-agreement algorithm, RFC 7748. Classic McEliece is KEM algorithm. SHAKE is a XOF function.
Optional /load/v/prehash field can contain the SHAKE256 hash
of the concatenated public keys in /load/v/pub/0, that could
save resources during Classic McEliece 6960-119+X25519+HKDF-SHAKE256 KEM
KDF calculations.