Adding value to JSON child array dynamically?

I am trying to implement a filter as shown in the image. I am using Angular JS framework, JQuery.

The requirement is , I have check box filter like Application Name , Status etc. On selecting an application or status I need to create a JSON dynamically like below . The value in "filterValues" should be automatically added or removed based on the check box values.

Based on the json value I will query the database and fetch the results and display.

I am constructing check box like below:

<div class="row-fluid">
<div ng-repeat="status in keywords.kw_Status">
    <label class="checkbox">
        <input type="checkbox" value="{{status}}" ng-model="isChecked" ng-change="change('Status','txt_Status',status,isChecked)">{{status}}
    </label>
</div>

The coressponding controller code is as below

$scope.change=function(filterCategory, filterField, filterValue, filterAdd){
$scope.filters[filterCategory]={"filterField":filterField,"filterValues":[filterValue]};
console.log($scope.filters);

}

Any help is much appreciated!!

{
"Region": {
    "filterField": "kw_Region",
    "filterValues": [
        "aa",
        "bb"
    ]
},
"ApplicationName": {
    "filterField": "kw_ApplicationName",
    "filterValues": [
        "aa",
        "bb"
    ]
},
"IssueType": {
    "filterField": "kw_IssueType",
    "filterValues": [
        "aa",
        "bb"
    ]
},
"Outage": {
    "filterField": "kw_Outage",
    "filterValues": [
        "aa",
        "bb"
    ]
},
"Priority": {
    "filterField": "kw_Priority",
    "filterValues": [
        "aa",
        "bb"
    ]
}

}