JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/1.0.2/Chart.min.js"></script>
<canvas id="chart" />

JavaScript

function Label(short, long) {
  this.short = short;
  this.long = long
}
Label.prototype.toString = function() {
  return this.short;
}

var data = {
    labels: [ 
      new Label("J", "JAN"), 
      new Label("F", "FEB"), 
      new Label("M", "MAR"),
      new Label("A", "APR"),
      new Label("M", "MAY"),
      new Label("J", "JUN"),
      new Label("J", "JUL")
    ],
    datasets: [
        {
            label: "My First dataset",
            fillColor: "rgba(220,220,220,0.5)",
            strokeColor: "rgba(220,220,220,0.8)",
            highlightFill: "rgba(220,220,220,0.75)",
            highlightStroke: "rgba(220,220,220,1)",
            data: [65, 59, 80, 81, 56, 55, 40]
        }
    ]
};

// create chart
var ctx = document.getElementById("chart").getContext('2d');
new Chart(ctx).Bar(data, {
  tooltipTemplate: "<%if (label){%><%=label.long%>: <%}%><%= value %>",
});