如何在通过ARM模板创建部署时从系统变量读取输入

"parameters": {
  "systemVariableName": {
    "type": "string",
    "defaultValue": "[systemvariables('SystemVariableName')]",
    "metadata": {
      "description": "Description of the system variable"
    }
  }
}

"resources": [
  {
    "type": "Microsoft.Compute/virtualMachines",
    "name": "virtualMachineName",
    "apiVersion": "2021-03-01",
    "location": "[resourceGroup().location]",
    "properties": {
      "hardwareProfile": {
        "vmSize": "[parameters('systemVariableName')]"
      },
      ...
    }
  }
]

New-AzResourceGroupDeployment -ResourceGroupName "resourceGroupName" -TemplateFile "templateFile.json" -systemVariableName "variableValue"