Not yet, but we are keeping our eyes on HTTP/3. There are a few good options for us to integrate it, but we want to make sure we do it right (and meanwhile figure out the right way to expose HTTP/2 features that aren't available yet).
Sounds like sales speak, nodejs isn’t even there yet.
There are like three different http/3 implementations in Rust, used in real ways. Even if they don't want to write their own, there's a lot of choice out there.