Javascript 如何对齐sankey图表的标签？

在本例中，当某些值相同（例如0）时，标签重叠。有人能帮我把这些标签垂直对齐吗？我希望将它们移动到节点/栏的顶部

Highcharts.chart('container', {

    series: [{
        keys: ['from', 'to', 'weight'],
        data: [
            ['Oil', 'Transportation', 94],
            ['Natural Gas', 'Transportation', 3],
            ['Coal', 'Transportation', 0],
            ['Renewable', 'Transportation', 0],
            ['Nuclear', 'Transportation', 3],

            ['Oil', 'Industrial', 0],
            ['Natural Gas', 'Industrial', 0],
            ['Coal', 'Industrial',0],
            ['Renewable', 'Industrial', 0],
            ['Nuclear', 'Industrial',0],

            ['Oil', 'Residential & Commercial', 0],
            ['Natural Gas', 'Residential & Commercial', 0],
            ['Coal', 'Residential & Commercial',0],
            ['Renewable', 'Residential & Commercial', 0],
            ['Nuclear', 'Residential & Commercial', 0],

            ['Oil', 'Electric Power', 0],
            ['Natural Gas', 'Electric Power', 0],
            ['Coal', 'Electric Power', 0],
            ['Renewable', 'Electric Power', 0],
            ['Nuclear', 'Electric Power', 0]
        ],
        type: 'sankey',
        name: 'Energy in the United States'
    }]

});

---

您可以将每个标签作为HTML元素返回：

plotOptions: {
  sankey: {
    dataLabels: {
      useHTML: true,
      nodeFormatter: function() {
        return "<span class='labelPosition label-" + this.colorIndex + "'>" + this.key + "</span>"
      }
    }
  }
},

---

在线演示：

将dataLabels.padding设置为-5是否足够@raf18seb填充选项是水平移动标签，我希望标签之间有相当大的垂直间隙。如何在CSS中手动定位每个标签？

.labelPosition {
  color: black;
  position: relative;
}

.label-0 {
  top: 0px;
}

.label-5 {
  top: 6px;
}

.label-6 {
  top: -1px;
}

.label-7 {
  top: 2px;
}

.label-8 {
  top: 12px;
}