1. First Attach Chartjs library to script area

<script src="//cdnjs.cloudflare.com/ajax/libs/Chart.js/2.1.4/Chart.min.js"></script>

2. Add canvas tag to html area

<canvas id="myChart" width="400" height="400"></canvas>

3. Copy the javascript code to your script js file, test the chart and then change labels and data with your original label and data.

    var ctx = document.getElementById('myChart').getContext('2d');
    var data = {{chartData.data | json}};
    var options = {{chartData.options | json}};

    var myChart = new Chart(ctx, {
        type: '{{chartData.type}}',
        data: data,
        options: options