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Return a specific item from within listKeys:

"outputs": {
    "IotHubKey": {
      "type": "string",
      "value": "[listKeys(resourceId('Microsoft.Devices/IotHubs/Iothubkeys', variables('iotHubName'), 'iothubowner'), '2016-02-03').primaryKey]"
    }
  }

* https://blog.mexia.com.au/list-of-access-keys-from-output-values-after-arm-template-deployment * https://stackoverflow.com/questions/39089675/azure-arm-list-keys-how-to-fetch-key-value-of-a-specific-key