It’s not Let’s Encrypt, but I’ve been happy with this Cloudflare-flavored ACME through Caddy.

github.com/CaddyBuilds/caddy-cloudflare

I really only use it for my local-hosted stuff that I don’t expose to the web. So, when I’m at home, radarr/.[mydomain].com resolves to 192.168.1.145:7878. That sort of thing…