如何使用plotly js显示竖排文本？

<script src="https://cdn.plot.ly/plotly-latest.min.js"></script>

<div id="myDiv"></div>

var data = [{
  type: 'scatter',
  x: [1, 2, 3, 4, 5],
  y: ['A', 'B', 'C', 'D', 'E'],
  mode: 'text',
  text: ['A', 'B', 'C', 'D', 'E'],
  textposition: 'middle center',
  hoverinfo: 'none'
}];

var layout = {
  title: '竖排文本示例',
  showlegend: false,
  xaxis: {
    showgrid: false,
    zeroline: false,
    showticklabels: false
  },
  yaxis: {
    showgrid: false,
    zeroline: false,
    showticklabels: false
  },
  orientation: 'v'
};

Plotly.newPlot('myDiv', data, layout);