They do, it is a draft [1]. There are other design flaws that also limit data path performance (ignoring encryption) to probably something on the order of just 30-50 Gbps/core though I would not be too surprised if you could get ~100 Gbps/core in a well-behaved case.
[1] https://datatracker.ietf.org/doc/draft-ietf-quic-ack-frequen...