In TLS 1.3, AES256-SHA384 is not mandatory to implement. If there is a freely available published specification of BLAKE3, you can request an assigned number for it in the TLS registry [1].
* Furthermore, NIST selected some post-quantum ciphers: https://nist.gov/pqcrypto<https://urldefense.com/v3/__https:/nist.gov/pqcrypto__;!!GjvTz_vk!UnGjNR1DVN3oU6LubE4pgg4dPlPTrCY8ZIZ3F6iSL5CBbMdhrYZfH98ug0kXkPGGj6Ed7T6V7j6iGg3ROTXRiMqB7ZBF$> Hm, are you new here? The archives have a couple hundred messages about post-quantum. [1] https://www.iana.org/assignments/tls-parameters/tls-parameters.xhtml#tls-parameters-4
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