JSFiddle - React, Tailwind, and code Playground

HTML

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

JavaScript

window.onload = function () {
  var chart = new CanvasJS.Chart("chartContainer", {
    title: {
      text: "Stripline on  Axis X"
    },
    axisX:{
      stripLines:[
        {                
          value: 1935
        }, {                
          value: 1945
        }
      ],
      valueFormatString: "####"
    },
    data: [
      {
        type: "splineArea",            
        color: "rgba(83, 223, 128, .6)",
        dataPoints: [
          { x: 1910, y: 5 }, 
          { x: 1920, y: 9 }, 
          { x: 1930, y: 17}, 
          { x: 1940, y: 32}, 
          { x: 1950, y: 22}, 
          { x: 1960, y: 14}, 
          { x: 1970, y: 25}, 
          { x: 1980, y: 18}, 
          { x: 1990, y: 20}
        ]
      }
    ]        
  });
  chart.render();
  
  
  var striplines = chart.axisX[0].stripLines;

  chart.addTo("data", {
  	type: "line",
    toolTipContent: null,
    highlightEnabled: false,
    markerSize: 0,
    dataPoints: [
    	{ x: striplines[0].get("value"), y: (chart.axisY[0].viewportMaximum + chart.axisY[0].viewportMinimum) / 2 },
      { x: (striplines[1].get("value") + striplines[0].get("value")) / 2, y: (chart.axisY[0].viewportMaximum - chart.axisY[0].viewportMinimum) / 2, indexLabel:  (striplines[1].get("value") - striplines[0].get("value")).toString()},
      { x: striplines[1].get("value"), y: (chart.axisY[0].viewportMaximum - chart.axisY[0].viewportMinimum) / 2 }
    ]
  });
}