Python how to insert objects in nested lists

How do I insert an object in nested lists. I get json response that doesn't return a a certain object for certain a condition

data.json

Note: in 'steps' list, the 3rd index did not return result

[
{
  "elements": [
    {
      "keyword": "Scenario", 
      "name": "valid user can login site", 
      "steps": [
        {
          "name": "a valid user name and password", 
          "result": {
            "status": "passed"
          }
        }, 
        { 
          "name": "a valid user clicking on the login button after typing in user name and password", 
          "result": { 
            "status": "passed"
          }
        }, 
        { 
          "name": "map should display" 
        }
      ]
    }
  ], 
  "keyword": "Feature", 
  "name": "login", 
  "status": "passed"
}
]

What I want to achieve:

I want to insert a 'result' object if it is absent

[
{
  "elements": [
    {
      "keyword": "Scenario", 
      "name": "valid user can login site", 
      "steps": [
        {
          "name": "a valid user name and password", 
          "result": {
            "status": "passed"
          }
        }, 
        { 
          "name": "a valid user clicking on the login button after typing in user name and password", 
          "result": { 
            "status": "passed"
          }
        }, 
        { 
          "name": "map should display" 
          "result": { 
            "status": "skipped"
          }
        }
      ]
    }
  ], 
  "keyword": "Feature", 
  "name": "login", 
  "status": "passed"
}
]

What i've done so far (pseudo):

with open('data.json') as data_file:  
     data = json.load(data_file) 

#nested for loops??
#if x.has_key('result') == False
#insert result object