在Z轴(highcharts)气泡图上显示百分比值

Highcharts.chart('container', {
    chart: {
        type: 'bubble'
    },
    title: {
        text: 'Z轴气泡图'
    },
    xAxis: {
        title: {
            text: 'X轴'
        }
    },
    yAxis: {
        title: {
            text: 'Y轴'
        }
    },
    zAxis: {
        title: {
            text: 'Z轴'
        }
    },
    plotOptions: {
        bubble: {
            dataLabels: {
                enabled: true,
                format: '{point.percentage}%'
            }
        }
    },
    series: [{
        data: [
            { x: 10, y: 20, z: 30, percentage: 50 },
            { x: 20, y: 30, z: 40, percentage: 75 },
            { x: 30, y: 40, z: 50, percentage: 90 }
        ]
    }]
});