How do I add nodes to a JSON object that aren't at the root level?

​@lahcenAglagal Unfortunately, you cannot. You can build it using string handling, or by writing your own JavaScript or Python code. 

{
  "name1": "MyData",
  "version1": "1.0",
  "APPS": {
    "name2": "MyData",
    "version2": "1.0"
  }
}

Hey ​@lahcenAglagal  you can use the String replace Action to replace particular Nodes with Updated values. You can create an default JSON Template in a String variable like:

{
  "name1": "",
  "version1": "",
  "APPS": {
    "name2": "",
    "version2": ""
  }
}

And use the Source String as the Whole template, Find as “name2”: “”

and Replace as “name2”:”$<The value you want>$”

or you can enter “NULL” in the JSON Response and replace that as well.