深入了解highcharts中的数据数组

Question

我有一个数组[["event",2],["status",30]]作为系列数据。我想为每个数据添加向下钻取。我怎么能这样做？

        series: [{
                    type: 'column',
                    name: 'Device Status',
                    data:  <?php echo json_encode($rows)?> ,
                    drilldown: 'animals'

                }],
                 drilldown: {
        series: [{
            id: 'animals',
            data: [
                ['Cats', 4],
                ['Dogs', 2],
                ['Cows', 1],
                ['Sheep', 2],
                ['Pigs', 1]
            ]
        }
                ] }