How to set up doh in openwrt

You can use the following:

1. NextDNS (official): Install the package according to the instructions https://github.com/nextdns/nextdns/wiki/OpenWRT and install the luci-app-nextdns package if you want a web console.

2. Use https-dns-proxy package: Install according to instructions https://openwrt.org/docs/guide-user/services/dns/doh_dnsmasq_https-dns-proxy or refer to the script

while uci -q delete https-dns-proxy.@https-dns-proxy[0]; do :; done
uci set https-dns-proxy.config.force_dns='0'
uci add https-dns-proxy https-dns-proxy
uci set https-dns-proxy.@https-dns-proxy[-1].resolver_url='https://dns.nextdns.io/<ID>'
uci set https-dns-proxy.@https-dns-proxy[-1].bootstrap_dns='45.90.28.0,45.90.30.0'
uci set https-dns-proxy.@https-dns-proxy[-1].listen_addr='127.0.0.1'
uci set https-dns-proxy.@https-dns-proxy[-1].listen_port='5053'
uci commit https-dns-proxy
/etc/init.d/https-dns-proxy restart

Good luck!