Can't get JSON object from a two dimensional array

In my directive I am calling a function that's returning me the content of a JSON file, the content looks like this:

{
    "UpdatedBy" : "Naguib",
    "UpdatedOn" : "29/09/2016",
    "UpdatedFrom": "data.doc",
    "100":
    [
        {
            "title":"Class View",
            "overview":"TBC",
            "menuItem":"TBC",
            "UpdatedBy" : "Naguib",
            "UpdatedOn" : "29/09/2016"
        }
    ],
    "101":
    [
        {
            "title":"Time Table",
            "overview":"TBC",
            "menuItem":"TBC",
            "UpdatedBy" : "Naguib",
            "UpdatedOn" : "29/09/2016"
        }
    ]
}

The function is working fine and returning me a JSON array in $scope.helptext So when I call helptext from HTML and pass the index of the first dimention it returns an array with the data but I can't get any data in the nested array:

 <pre>
        ONE
        {{helptext[101]}}
        TWO
        {{helptext[101].menuItem}}
        THREE
        {{helptext[101][menuItem]}}
        FOUR
        {{helptext[101]['menuItem']}}
 </pre>

returns

The html that is generated is exactly how it looks:

<pre class="ng-binding">                
                ONE
                [{"title":"Time Table","overview":"TBC","menuItem":"TBC","UpdatedBy":"Naguib","UpdatedOn":"29/09/2016"}]
                TWO

                THREE

                FOUR

</pre>

Any help is appreciated!