How to force nginx-proxy to use specific network?

Question

I use nginx-proxy with companion to generate SSL certs for my services. One of my service has couple networks:

  yopass:
    restart: always
    image: jhaals/yopass
    environment:
      - VIRTUAL_HOST=example.com
      - LETSENCRYPT_HOST=example.com
      - LETSENCRYPT_EMAIL=info@example.com
    command: "--memcached=memcached:11211 --port 80 --max-length 5000000"
    expose:
      - "80"
    networks:
      db-net:
      office-net:

upstream otm.black-list.info {
        # Cannot connect to network 'otm_db-net' of this container
        # Fallback entry
        server 127.0.0.1 down;
}

Is it possible to configure nginx-proxy to use desired network? eg. office-net