Container über Container Routen?

version: '3.4'

services:
  vpn:
    image: j33f/openvpn-client
    container_name: QNAP-vpn
    privileged: true
    restart: always
    cap_add:
      - NET_ADMIN
    devices:
      - /dev/net/tun
    #dns:
    #  - 8.8.8.8
    #  - 8.8.4.4
    ports:
      - "3129:3129"
      - "5800:5800"
    volumes:
      - /etc/localtime:/etc/localtime:ro
      - ./vpn/config/config.ovpn:/conf.ovpn
    environment:
      - OVPNUSERNAME=VPNBenutzername
      - OVPNPASSWORD=VPNKennwort
    networks:
      qnetwork:
        ipv4_address:  192.168.178.233

  jdownloader-2:
    container_name: QNAP-JDownloader
    image: jlesage/jdownloader-2
    restart: always
    volumes:
      - "./config:/config:rw"
      - "./Downloads:/output:rw"
    environment:
      - USER_ID=1000
      - GROUP_ID=100
      - EMAIL=Benutzername
      - PASSWORD=Kennwort
      - TZ=Europe/Berlin
    depends_on:
      - vpn                        # /!\ this is needed so that the vpn container launch first
    network_mode: "service:vpn"    # /!\ imporant: this will make this container to use the vpn for internet traffic

networks: 
  qnetwork:
    external:
      name: qnet-static-bond0-b03c93