services:
  test:
    image: nginx
    networks:
      - br-test

networks:
  br-test:
    driver: bridge
    ipam:
      config:
        - subnet: 172.17.4.0/24
          gateway: 172.17.4.1

[
    {
       ...
        "IPAM": {
            "Driver": "default",
            "Config": [
                {
                    "Subnet": "172.17.4.0/24"
                }
            ]
        }
        ...
    }
]