I love caddy, I used to litter my docker-compose.yaml files with Traefik labels like:

    labels:
      - traefik.enable=true
      - traefik.http.routers.foundryvtt-http.entrypoints=web
      - traefik.http.routers.foundryvtt-http.rule=Host(`vtt.xxx.nl`)
      - traefik.http.routers.foundryvtt-http.middlewares=foundryvtt-https
      - traefik.http.middlewares.foundryvtt-https.redirectscheme.scheme=https
      - traefik.http.routers.foundryvtt.middlewares=foundryvtt-auth
      - traefik.http.middlewares.foundryvtt-auth.basicauth.users=${foundryvtt-BASIC_AUTH}
      - traefik.http.routers.foundryvtt.entrypoints=websecure
      - traefik.http.routers.foundryvtt.rule=Host(`vtt.xxx.nl`)
      - traefik.http.routers.foundryvtt.tls=true
      - traefik.http.routers.foundryvtt.tls.certresolver=mytlschallenge
      - traefik.http.services.foundryvtt.loadbalancer.server.port=30000

Now I just add the containers (by name), no labels, and map Caddy to their port, like so (in the Caddyfile):

    data.xxx.com {
         reverse_proxy projectsend:80
    }

or, this snippet refers to a WordPress container with BasicAuth in front of it:

    restricted.xxxx.com {
            root * /var/www/html/restricted.xxxx.com/wordpress
            php_fastcgi wordpress-xxxx-restricted:9000 {
             root /var/www/html
                    }
            basicauth /* {
             xxx $xx$x05xxxxxxxxx.xx
            }
            file_server
    }

Here's just an index.html (from Hugo in this case) in some dir:

    blog.xxx.nl {
     # Set this path to your site's directory.
         root * /var/www/html/blog.xxx.nl
     # Enable the static file server.
     file_server
    }

I love the simplicity.