[
  [
    "/subscriptions/YOUR_SUBSCRIPTION_ID/resourceGroups/YOUR_APIM_RESOURCE_GROUP/providers/Microsoft.ApiManagement/service/YOUR_APIM_NAME/backends/YOUR_POOL_ID",
    {
      "properties": {
        "type": "Pool",
        "description": "YOUR_OWNERSHIP_DESCRIPTION",
        "pool": {
          "services": [
            {"id": "/subscriptions/YOUR_SUBSCRIPTION_ID/resourceGroups/YOUR_APIM_RESOURCE_GROUP/providers/Microsoft.ApiManagement/service/YOUR_APIM_NAME/backends/YOUR_BACKEND_1_ID", "priority": 1, "weight": 1},
            {"id": "/subscriptions/YOUR_SUBSCRIPTION_ID/resourceGroups/YOUR_APIM_RESOURCE_GROUP/providers/Microsoft.ApiManagement/service/YOUR_APIM_NAME/backends/YOUR_BACKEND_2_ID", "priority": 1, "weight": 1}
          ]
        }
      }
    }
  ]
]