I just stumbled across this article explaining the new SVCB and HTTPS record types: https://blog.cloudflare.com/speeding-up-https-and-http-3-negotiation-with-dns
Basically they can instruct clients to load a website through HTTP/3 straight away without having to make a HTTP/2 request first (to look for an Alt-Svc header) and without having to make a HTTP request first (to see if there is a redirect to HTTPS).
I would love to be able to add such records in my HE DNS configuration. Or maybe there is already a way?