Highcharts- Unable to change yAxis label - angularjs

Question

I am trying to render charts using the Highcharts js-library. As I am working with AngularJS, I am using an AngularJS directive for HighCharts.
I made everything work fine but due to some weird reason, I am unable to change the yAxis label value.
I get the default value "Values" shown on the chart's y-axis, which I checked is defined in the highcharts.js file under "defaultYAxisOptions".
Html:
<div ng-app="myapp">
<div ng-controller="myctrl">
<highchart id="chart1" config="chart"></highchart>
</div>
</div>
Javascript:
var myapp = angular.module('myapp', ["highcharts-ng"]);
myapp.controller('myctrl', function ($scope) {
$scope.chart = {
options: {
chart: {
type: 'bar'
}
},
xAxis: {
title: {
text: 'x-axix-label'
}
},
yAxis: {
title: {
text: 'y-axix-label'
}
},
series: [{
data: [10, 15, 12, 8, 7]
}],
title: {
text: 'Hello'
},
loading: false
}
});
Sample implementation: http://jsfiddle.net/VwTCn/9/
Can someone please point out the mistake here.

Answer 1

Took me a while, to understand, that highcharts-ng doesn't work, using the original highcharts options structure.
Anyway, for some reason it works, if you put you yAxis config into the options object, like this:
...
options: {
chart: {
type: 'bar'
},
yAxis: {
title: {
text: 'y-axis label'
}
}
},
xAxis: {
title: {
text: 'x-axis label'
}
},
series: [{
...
See example: http://jsfiddle.net/martinczerwi/VwTCn/13/