Highcharts with angularjs drilled down does not work - json

Question

I am developing a drilled down chart using HichartJS, the chart is getting generated but drill down is not functioning properly.
I need the back button as well so that user can go back to the previous data.
Here is my code,
HTML:
<div ng-controller="myctrl">
<highchart id="chart1" config="highchartsNG"></highchart>
</div>
JS:
var myapp = angular.module('myapp', ["highcharts-ng"]);
myapp.controller('myctrl', function ($scope) {
$scope.highchartsNG = {
options: {
chart: {
type: 'column'
}
},
title: {
text: 'Basic drilldown'
},
xAxis: {
type: 'category'
},
legend: {
enabled: false
},
plotOptions: {
series: {
borderWidth: 0,
dataLabels: {
enabled: true,
}
}
},
series: [{"data":[{"name":"Hiring","y":390309.25,"drilldown":"PRIME MOVER"},{"name":"Private","y":406746.97,"drilldown":"PRIME MOVER"}],"name":"series1","color":"","type":"area"}],
drilldown: {
series: [{"id":"Hiring","data":[["MOTOR CAR",97610],["VAN",129750],["THREE WHEELER",62949.25],["PRIME MOVER",100000]]},{"id":"Private","data":[["MOTOR CAR",488356.97],["VAN",129750],["THREE WHEELER",78949.25],["PRIME MOVER",100000]]}]
}
}
});
Here is the Plunker

Answer 1

Update2 I have made changes for your data , The problem was in formatting of json and the second problem was you were not calling proper id in drillDown. Check the fiddle updated Here with your data
Update1 I have made changes and now its working on fiddle Here . I have added changes to highcharts-ng in script tag in html section of fiddle. Also I changed the data, because your data was not formatted for me.
I just realize that drillDown feature isn't supported by highcharts-ng .see the link Highcharts-ng with drilldown
Following edit was done at source code to make it work.
if(config.drilldown) {
mergedOptions.drilldown = config.drilldown;
};