Any chance in running Lizmap Docker under traefik1?

Hello everyone,
I'm using traefik1 for my very simple website [portainer, owncloud, website] and I have on the same VPS a docker running Lizmap (a webmap server) that can be reached at it NGINX IP Address.
What I would like to do is to add the service to traefik, I did try adding simple labels to nginx service

labels:
  - traefik.enable=true
  - traefik.backend=lizmap
  - traefik.frontend.rule=Host:lizmap.officinecartografiche.net
  - traefik.docker.network=web
  - traefik.port=8888

but aint' that easy and I get errors heiter:
Gateway Timeout
Bad Gateway

Anyone here knows how to deal with it?
thanks