how to read django data in javascript from Built-in template tags

in my program  javascript dont read the data which is got from django but the same page html tag the the data.

here is my code

 <script>

       

        var bubbleChartData = {

            datasets: [ {

                label: "Graph of Attacks",

                  backgroundColor:"#FF6384",

            data: '{{ b }}',....................................problam in this line this data cant read.this data sample [{ 'r':15, 'x':45, 'y':5}];

            backgroundColor:"#FF6384",

            hoverBackgroundColor: "#FF6384",

            }]

        };

        window.onload = function() {

            var ctx = document.getElementById("canvas").getContext("2d");

            window.myChart = new Chart(ctx, {

                type: 'bubble',

                data: bubbleChartData,

                options: {

                    responsive: true,

                    title:{

                        display:true,

                        text:'Attack chain'

                    },

                }

            });

        };

    </script>

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