Chart.js:如何对数据集的图例进行分组？那么多个数据集可以一次切换吗？

var chart = new Chart(ctx, {
    type: 'bar',
    data: {
        datasets: [{
            label: 'Group A',
            data: [10, 20, 30],
            backgroundColor: 'red'
        }, {
            label: 'Group B',
            data: [15, 25, 35],
            backgroundColor: 'blue'
        }, {
            label: 'Group C',
            data: [5, 15, 25],
            backgroundColor: 'green'
        }],
        labels: ['January', 'February', 'March']
    },
    options: {
        legend: {
            labels: {
                generateLabels: function(chart) {
                    var datasets = chart.data.datasets;
                    var labels = chart.data.labels;
                    var legendItems = [];

                    datasets.forEach(function(dataset, datasetIndex) {
                        var label = dataset.label;
                        var backgroundColor = dataset.backgroundColor;

                        // 根据label属性分组图例标签
                        if (label.startsWith('Group')) {
                            var legendItem = {
                                text: label,
                                fillStyle: backgroundColor,
                                hidden: false,
                                datasetIndex: datasetIndex
                            };

                            legendItems.push(legendItem);
                        }
                    });

                    return legendItems;
                }
            }
        }
    }
});