Want to push some key value pair to a nested json : JSON: 1

{
        "sourcePath": "vv",
        "targetPath": "bb"
    }
I'm get a key value pair like JSON:1 and already I have a nested json like JSON:2 

JSON : 2

{
    "user": "hdpsrvc",
    "update": "13/06/2016 17:43:22",
    "template": "template_1",
    "formBody": [
        {
            "tabIndex": 0,
            "type": "text",
            "name": "sourcePath",
            "label": "Source path"
        },
        {
            "tabIndex": 1,
            "type": "text",
            "name": "targetPath",
            "label": "Target path"
        }
    ],
}

and I want to push the key value pair of JSON:1 to nested json like below (please see the red mark bold key value pair under formBody)

{
    "user": "hdpsrvc",
    "update": "13/06/2016 17:43:22",
    "template": "template_1",
    "formBody": [
        {
            "tabIndex": 0,
            "type": "text",
            "name": "sourcePath",
            "label": "Source path",
            "sourcePath": "vv"
        },
        {
            "tabIndex": 1,
            "type": "text",
            "name": "targetPath",
            "label": "Target path",
            "targetPath": "bb"
        }
    ],
}

I'm working with angular
Thanks in advance.

