how to put an object in an array? : My array is like this

    "taxDetails": [
    {
      "taxType": "Flat Service Charge",
      "taxAmount": 0
    },
    {
      "taxTypeId": "1",
      "taxType": "Service Tax",
      "validFrm": "2016-01-18",
      "validTo": "2020-02-27",
      "taxPrctgSbt": 200,
      "taxPrctg": 14.5,
      "taxAmount": 300,
      "remarks": "test"
    },
    {
      "taxTypeId": "2",
      "taxType": "VAT",
      "validFrm": "2016-01-18",
      "validTo": "2020-02-29",
      "taxPrctgSbt": 300,
      "taxPrctg": 12.5,
      "taxAmount": 400,
      "remarks": "rest"
    },
    {
      "taxTypeId": "3",
      "taxType": "Swatch Bharath Cess",
      "validFrm": "2016-01-18",
      "validTo": "2020-03-31",
      "taxPrctgSbt": 400,
      "taxPrctg": 1,
      "taxAmount": 500,
      "remarks": "fest"
    },
    {
      "taxTypeId": "5",
      "taxType": "Swatch Bharath Cess",
      "validFrm": "2016-01-18",
      "validTo": "2020-03-31",
      "taxPrctgSbt": 400,
      "taxPrctg": 1,
      "taxAmount": 500,
      "remarks": "fest"
    },
    {
      "taxTypeId": "6",
      "taxType": "Percent Service Char",
      "validFrm": "2016-01-18",
      "validTo": "2020-08-01",
      "taxPrctgSbt": 200,
      "taxPrctg": 10,
      "taxAmount": 200,
      "remarks": "zest"
    },
    {
      "taxTypeId": "7",
      "taxType": "Percent Service Char",
      "validFrm": "2016-01-18",
      "validTo": "2020-08-01",
      "taxPrctgSbt": 300,
      "taxPrctg": 15,
      "taxAmount": 200,
      "remarks": "zest"
    }
  ]

and my code is

    $scope.paymentForm.taxDetails = [];
	//$scope.taxDetails =  [];
	var flat= {"flat" : true};
	$scope.taxList = function () {
		$http.get('http://192.168.0.113:8080/feasthunt/registration/getTaxDetails?restUniqCode='+uniqueCode)
		.success(function (response) {
			
			$scope.paymentForm.taxDetails = response;
			
			for(var i=0; i< $scope.paymentForm.taxDetails.length; i++){
				 $scope.paymentForm.taxDetails[i].push( flat );
				    }
		})
		.error(function (data, status, header, config) {
			//alert('error');
		});
	};
	$scope.taxList();

I want add another object in every array of elements.
And final result will be like this 

    "taxDetails": [
    {
      "taxType": "Flat Service Charge",
      "taxAmount": 0,
	  "flat": true
    },
    {
      "taxTypeId": "1",
      "taxType": "Service Tax",
      "validFrm": "2016-01-18",
      "validTo": "2020-02-27",
      "taxPrctgSbt": 200,
      "taxPrctg": 14.5,
      "taxAmount": 300,
      "remarks": "test",
	  "flat": true
    },
    {
      "taxTypeId": "2",
      "taxType": "VAT",
      "validFrm": "2016-01-18",
      "validTo": "2020-02-29",
      "taxPrctgSbt": 300,
      "taxPrctg": 12.5,
      "taxAmount": 400,
      "remarks": "rest",
	  "flat": true
    },
    {
      "taxTypeId": "3",
      "taxType": "Swatch Bharath Cess",
      "validFrm": "2016-01-18",
      "validTo": "2020-03-31",
      "taxPrctgSbt": 400,
      "taxPrctg": 1,
      "taxAmount": 500,
      "remarks": "fest",
	  "flat": true
    },
    {
      "taxTypeId": "5",
      "taxType": "Swatch Bharath Cess",
      "validFrm": "2016-01-18",
      "validTo": "2020-03-31",
      "taxPrctgSbt": 400,
      "taxPrctg": 1,
      "taxAmount": 500,
      "remarks": "fest",
	  "flat": true
    },
    {
      "taxTypeId": "6",
      "taxType": "Percent Service Char",
      "validFrm": "2016-01-18",
      "validTo": "2020-08-01",
      "taxPrctgSbt": 200,
      "taxPrctg": 10,
      "taxAmount": 200,
      "remarks": "zest",
	  "flat": true
    },
    {
      "taxTypeId": "7",
      "taxType": "Percent Service Char",
      "validFrm": "2016-01-18",
      "validTo": "2020-08-01",
      "taxPrctgSbt": 300,
      "taxPrctg": 15,
      "taxAmount": 200,
      "remarks": "zest",
	  "flat": true
    }
  ]
 Any one can give the answer for my question because it's very urgent requirement
Thanks for responses
