Help setting up Quad9 DoH on OpenWRT

I’m looking to set up Quad9 DoH on the router but some stuff I don’t understand.

I tried to follow: [OpenWrt Wiki] DoH with Dnsmasq and https-dns-proxy

If that link fails it’s called DoH with Dnsmasq and https-dns-proxy on the OpenWRT wiki.

So I install luci-app-https-dns-proxy. It autoconfigures Cloudflare but I want Quad9. It has an option for Quad9 so I click it via dropdown. It starts asking for a ridiculous amount of stuff I have no idea about like listen port. CloudFlare was set to 5053 and NextDNS was 5054. Quad9 was just totally blank on listen port and I had no idea what to input.

What do I actually do? On the browser level, I got it working by inputting the DoH address of Quad9 into the Firefox full protection box after selecting Custom but I wanted router level.

Thank you

I think you would be better served asking this on the openwrt forum.