“Routing” you show here is really proxying the traffic from one port to another, it’s not a feature of DNS. CF actually does provide this service, but it’s an enterprise feature. https://www.cloudflare.com/products/Cloudflare-spectrum/ #security:spectrum.
CF doesn’t provide this to non-enterprise customers due to the amount of abuse that could be possible (inspecting non-HTTP traffic is a complicated issue for detecting abuse) and the pricing for it could get complicated. Vote on this IPv6 Spectrum for non‑Enterprise customers if you’re interested.