具有多个系列的 highcharts 的可访问性

如何解决具有多个系列的 highcharts 的可访问性

 
 Highcharts.chart('container',{

            chart: {
                //renderTo: document.getElementById("container"),type: 'column'
            },accessibility: {
                description:'access description'
            },title: {
                text: 'this is the graph'
            },xAxis: {
                categories: [
            'Jan','Feb','Mar','Apr','May','Jun','Jul','Aug','Sep','Oct','Nov','Dec'
        ],},yAxis: {
        min: 0,title: {
            text: 'Rainfall (mm)'
        }
    },plotOptions: {
        column: {
            pointPadding: 0.2,borderWidth: 0,showInLegend: true
        }
    },series: [{
        name: 'Tokyo',data: [49.9,71.5,106.4,129.2,144.0,176.0,135.6,148.5,216.4,194.1,95.6,54.4]
       

    },{
        name: 'japan',data: [29.9,73.5,45.2,54.4]

    }]
        });

<script src="https://code.highcharts.com/highcharts.js"></script>
<script src="https://code.highcharts.com/modules/series-label.js"></script>
<script src="https://code.highcharts.com/modules/exporting.js"></script>
<script src="https://code.highcharts.com/modules/export-data.js"></script>
<script src="https://code.highcharts.com/modules/accessibility.js"></script>
<script src="https://code.highcharts.com/themes/high-contrast-light.js"></script>

<div id="container" tabindex="0" style="padding: 10px 1px 1px 1px; height: 240px; width: 500px;"></div>


                                                    

我有一个包含两个系列的柱状图。在这种情况下，叙述者在读取数据时会产生问题，而在一个系列中，它是有效的。对此有何见解？

演示项目：jsfiddle.net/pfsbyxwz/3