How can I create an ocelot.json with a dynamic service name for different environments? Like I need to create a docker gateway image, which one I can deploy with any DownstreamHostAndPorts address by using an environment variable.

In this code, I need to change localhost dynamically by the environment variable. like

env_service_url="testdomain.com" `

{
  "ReRoutes": [
    {
      "DownstreamPathTemplate": "/api/{everything}",
      "DownstreamScheme": "http",
      "DownstreamHostAndPorts": [
        {
          "Host": "localhost",
          "Port": 5001
        }
      ],
      "UpstreamPathTemplate": "/user-api/{everything}"
    }
  ],
  "GlobalConfiguration": {
    "ServiceDiscoveryProvider": {
  }`enter code here`
}

`