JSFiddle - React, Tailwind, and code Playground

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HTML

<script src="https://canvasjs.com/assets/script/canvasjs.min.js"></script>
<div id="chartContainer" style="height: 300px; width: 100%;"></div>

JavaScript

var chart = new CanvasJS.Chart("chartContainer", {
  animationEnabled: true,
  theme: "light2", // "light1", "light2", "dark1", "dark2"
  title:{
    text: "Column Chart with Index Labels on Empty Data Points"
  },
  data: [{        
    type: "column",  
    showInLegend: true, 
    legendMarkerColor: "gold",
    color: "lightblue",
    indexLabelOrientation: "vertical",
    legendText: "Hours",
    dataPoints: [      
      { y: 40, label: "Goal", color: "gold" },
      { y: 0,  label: "SUN" },
      { y: 0,  label: "MON" },
      { y: 0,  label: "TUES" },
      { y: 0,  label: "WED" },
      { y: 70, label: "THURS" },
      { y: 20,  label: "FRI" },
      { y: 30,  label: "SAT" }
    ]
  }]
});
chart.render();

addEmptyIndexLabel();

function addEmptyIndexLabel() {
	for(var i = 0; i < chart.options.data[0].dataPoints.length; i++) {
  	if(chart.options.data[0].dataPoints[i].y === 0) {
    	 chart.options.data[0].dataPoints[i].indexLabel = "EMPTY"
    }
    chart.render();
  }
}