neutron-lib/api-ref/source/v2/samples/port_forwardings/port-fowarding-update-request.json

{
  "port_forwarding": {
    "protocol": "udp",
    "internal_port": 37,
    "internal_port_id": "99889dc2-19a7-4edb-b9d0-d2ace8d1e144",
    "external_port": 1960
  }
}