如何在chartjs中突出显示特定的数据点，我的数据来自json数组？

var data = [
  { x: 1, y: 10 },
  { x: 2, y: 5 },
  { x: 3, y: 8 },
  { x: 4, y: 2 },
  { x: 5, y: 6 }
];

var ctx = document.getElementById('myChart').getContext('2d');
var myChart = new Chart(ctx, {
  type: 'line',
  data: {
    datasets: [{
      label: 'My Dataset',
      data: data
    }]
  }
});

var options = {
  onHover: function(event, elements) {
    if (elements.length > 0) {
      var index = elements[0]._index;
      var datasetIndex = elements[0]._datasetIndex;
      var dataset = myChart.data.datasets[datasetIndex];
      
      dataset.pointBackgroundColor = [];
      dataset.pointBorderColor = [];
      
      for (var i = 0; i < dataset.data.length; i++) {
        if (i === index) {
          dataset.pointBackgroundColor.push('red');
          dataset.pointBorderColor.push('red');
        } else {
          dataset.pointBackgroundColor.push('blue');
          dataset.pointBorderColor.push('blue');
        }
      }
      
      myChart.update();
    }
  }
};

myChart.options = options;

<canvas id="myChart"></canvas>