how to add new column into elemnt in the exsing json angular

Hi  Good Evening ,

I want add the new column exsisitng json below mentioned JSON file 

{
      "name": "page3",
      "title": "Blood Pressure Form",
      "elements": [
        {
          "type": "text",
          "name": "question23",
          "title": "Sys/Dia"
        },
        {
          "type": "radiogroup",
          "name": "question24",
          "title": "BP Treated",
          "choices": [
            "Yes",
            "No"
          ]
        },
        {
          "type": "text",
          "name": "question25",
          "title": "Pulse"
        }
      ]
    }