https://docs.pi-hole.net/guides/dns/cloudflared/
I use this to translate DNS to DoH, and use cloudflare, and quad9 upstream.
environment:
- TUNNEL_DNS_UPSTREAM=https://1.1.1.1/dns-query,https://1.0.0.1/dns-query,https://9.9.9.9/dns-query,https://149.112.112.9/dns-query
Haven't really noticed any DNS based lag.