Higcharts:当有不同颜色的plotBand时，如何在图表上呈现背景文本？

{
  chart: {
    type: 'line'
  },
  title: {
    text: 'Example Chart'
  },
  xAxis: {
    categories: ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec']
  },
  yAxis: {
    plotBands: [{
      from: 0,
      to: 5,
      color: 'rgba(0, 255, 0, 0.1)',
      label: {
        text: 'Low Range',
        align: 'center',
        verticalAlign: 'middle',
        x: 0,
        y: 0
      }
    }, {
      from: 5,
      to: 10,
      color: 'rgba(255, 0, 0, 0.1)',
      label: {
        text: 'High Range',
        align: 'center',
        verticalAlign: 'middle',
        x: 0,
        y: 0
      }
    }],
    title: {
      text: 'Value'
    }
  },
  series: [{
    name: 'Data',
    data: [7, 3, 5, 8, 2, 9, 4, 6, 1, 10, 3, 5]
  }]
}