JSFiddle - React, Tailwind, and code Playground

by Flexmonster Pivot Table

HTML

<link rel="stylesheet" href="https://s3.amazonaws.com/flexmonster/2.3/demo.css">
<script src="https://cdn.flexmonster.com/flexmonster.js"></script>

<div id="pivot-container"></div>

CSS

#fm-pivot-view .fm-grid-view div.fm-cell[hierarchy-r-0="Country"][member-r-0="Canada"] {
  background-color: #CCCCCC;
}

#fm-pivot-view .fm-grid-view div.fm-cell[measure="Price"],
#fm-pivot-view .fm-grid-view div.fm-cell.fm-header[measure="Price"] {
  background-color: #B2DBBF;
}

JavaScript

let pivot = new Flexmonster({
  container: "pivot-container",
  componentFolder: "https://cdn.flexmonster.com/",
  toolbar: true,
  customizeCell: customizeCellFunction,
  report: {
    "dataSource": {
      "filename": "data/retail-data.json",
      mapping: {
        "Order Date": {
          type: "year/month/day"
        }
      }
    },
    slice: {
      rows: [{
        uniqueName: "Country"
      }, {
        uniqueName: "Status"
      }],
      columns: [{
        uniqueName: "Order Date",
        levelName: "Order Date.Month"
      }, {
        uniqueName: "[Measures]"
      }],
      measures: [{
        uniqueName: "Price",
        aggregation: "sum"
      }]
    }
  }
});

const monthRegex = /^(January|February|March|April|May|June|July|August|September|October|November|December)/;
  

function customizeCellFunction(cell, data) {
  if (data.type == "header" && data.columns.length > 0 && data.member && data.member.hierarchyName == "Order Date" && monthRegex.test(data.member.caption)) {

    const year = data.member.parentMember.match(/\d+/g);
   cell.text = cell.text.replace(monthRegex, "$& "+year);
  }
}