I'm not super familiar with Traefik, but if you're talking about using container labels for config, no, Caddy's config is given as a JSON document through a REST API. The CLI can let you use config files if you prefer. Or the Caddyfile is a more human-friendly format that Caddy supports by default. You can actually use any config format you want if there's a config adapter for it: https://caddyserver.com/docs/config-adapters