JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://canvasjs.com/assets/script/canvasjs.min.js"></script>
<br/><!-- Just so that JSFiddle's Result label doesn't overlap the Chart -->
<div id="chartContainer" style="height: 360px; width: 100%;"></div>

JavaScript

var max = 0;
var chart = new CanvasJS.Chart("chartContainer", {
  data: [
    {
      type: "bar",
      dataPoints: [
        { x: 10, y: 71, indexLabelToDisplay: "high" },
        { x: 20, y: 55, indexLabelToDisplay: "medium" },
        { x: 30, y: 50, indexLabelToDisplay: "low" }
      ]
    }					
  ]
});
addLabels();

function addLabels(){

  for( var i = 0; i<chart.options.data.length; i++ )
    for( var j = 0; j<chart.options.data[i].dataPoints.length; j++ )
      if( max < chart.options.data[i].dataPoints[j].y)
        max = chart.options.data[i].dataPoints[j].y;

  var dataSeriesLength = chart.options.data.length;
  for( var i = 0; i<dataSeriesLength; i++ ){
    chart.options.data.push({type: "error",
                             whiskerThickness: 0,
                             linkedDataSeriesIndex: i,
                             dataPoints: []});
  }

  for( var i = 0; i<dataSeriesLength; i++ )                          
    for( var j = 0; j<chart.options.data[i].dataPoints.length; j++ )
      chart.options.data[i + dataSeriesLength].dataPoints.push({x: chart.options.data[i].dataPoints[j].x, y: [max/2,max/2], indexLabelToDisplay: chart.options.data[i].dataPoints[j].indexLabelToDisplay,indexLabelFormatter: function ( e ) {
        if(e.index === 0)   
          return e.dataPoint.indexLabelToDisplay;
        else
          return " ";

      }   });

}

chart.render();