import json
unflatten_json = """
{
  "type": "array",
  "items": {
    "type": "object",
    "properties": {
      "active": {
        "type": "boolean"
      },
      "displayOrder": {
        "type": "integer"
      },
      "label": {
        "type": "string"
      },
      "pipelineId": {
        "type": "string"
      },
      "stages": {
        "type": "array",
        "items": {
          "type": "object",
          "properties": {
            "active": {
              "type": "boolean"
            },
            "closedWon": {
              "type": "boolean"
            },
            "displayOrder": {
              "type": "integer"
            },
            "label": {
              "type": "string"
            },
            "probability": {
              "type": "integer"
            },
            "stageId": {
              "type": "string"
            }
          }
        }
      }
    }
  }
}
"""

def flatten(dic):
    flat = []
    for k, v in dic.items():
        if isinstance(v, dict):
            flat += [(k + '.' + value[0], value[1]) for value in  flatten(v)]
        else:
            flat += [(k, v)]

    return flat

data = json.loads(unflatten_json)
data = dict(flatten(data))
#json is ready
parent_object_you_want_to_apply = "SomethingISetToGoHere"
data = {parent_object_you_want_to_apply:data}
print(data)