score:0

Accepted answer

I was able to achieve something close using the following:

                            let draw = Chart.controllers.radar.prototype.draw;
                            Chart.controllers.radar.prototype.draw = function() {
                              let chart = this.chart;
                              let ctx = chart.ctx;
                              let _stroke = ctx.stroke;
                              ctx.stroke = function() {
                                ctx.save();
                                ctx.shadowColor = 'rgba(3, 252, 240, 1)' //ctx.strokeStyle;
                                ctx.shadowBlur = 40;
                                ctx.shadowOffsetX = 0;
                                ctx.shadowOffsetY = 0;
                                _stroke.apply(this, arguments);
                                ctx.restore();
                              };
                              draw.apply(this, arguments);
                              ctx.stroke = _stroke;
                            }
                            

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