score:2

Please check my JSfiddle Polar Chart for your answer,

I had used extra extensions named

chartjs-plugin-datalabels

let me know if any more help require

score:3

There is another option using this extension:

Chart.PieceLabel.js

Here is a fiddle: https://jsfiddle.net/beaver71/39293jes/

or a snippet in SO:

angular.module("app", ["chart.js"]).controller("ChartCtrl", function($scope) {

    $scope.labels = ["January", "February", "March", "April", "May", "June", "July"];
    
    $scope.data = [65, 59, 80, 81, 56, 55, 40];
    var sum = $scope.data.reduce(function add(a, b) {
        return a + b;
    }, 0);
    
    $scope.options = {
      pieceLabel: {
        render: function (args) {
          return args.label + " " + Math.round(args.value*100/sum,2)+"%";
        },
        fontColor: '#000',
        position: 'outside',
        segment: true
      }
    };
  
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/angular.js/1.5.8/angular.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.7.1/Chart.js"></script>
<script src="https://cdn.jsdelivr.net/angular.chartjs/latest/angular-chart.js"></script>
<script src="https://rawgit.com/beaver71/Chart.PieceLabel.js/master/build/Chart.PieceLabel.min.js"></script>

<div ng-app="app" ng-controller="ChartCtrl">
  <canvas id="pie" class="chart chart-polar-area"
         chart-data="data" chart-labels="labels" chart-options="options">
  </canvas> 
</div>


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