The most complete I’ve seen for QUIC is https://github.com/g-andrade/quack which has been archived. Since HTTP/3 moves parts for flow control to the protocol QUIC that were in the application level with HTTP/2 I have meant to look at if an http/2 library, like https://github.com/joedevivo/chatterbox, would make sense as a starting point to pull some parts out of for build quic.
Also, TLS 1.3 is required though, isn’t it? I know it is at least partially available in OTP 22 but I don’t know that all necessary components are available.
