JSFiddle - React, Tailwind, and code Playground

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="pivotContainer"></div>

CSS

.link {
  text-decoration: underline !important;
  cursor: pointer;
  color: #726b04 !important;
}

JavaScript

var pivot = new Flexmonster({
  container: "pivotContainer",
  componentFolder: "https://cdn.flexmonster.com/",
  toolbar: true,
  report: {
    dataSource: {
      data: getData(),
      mapping: {
        Country: {
          type: "string"
        },
        CountryId: {
        type: "id",
        hierarchy: "Country"
        },
        Year: {
          type: "string"
        },
        Cases: {
          type: "number"
        }
      }
    },
    "slice": {
      "rows": [{
        "uniqueName": "Country"
      }],
      "columns": [{
          "uniqueName": "Year"
        },
        {
          "uniqueName": "[Measures]"
        }
      ],
      "measures": [{
        "uniqueName": "Cases",
        "aggregation": "sum"
      }]
    }
  }
});

let urlList = {
  "USA": "https://en.wikipedia.org/wiki/United_States",
  "Canada": "https://en.wikipedia.org/wiki/Canada",
  "Mexico": "https://en.wikipedia.org/wiki/Mexico"
}

flexmonster.customizeCell((cell, data) => {
  if (data.hierarchy && data.hierarchy.uniqueName == "Country" && data.member) {
    let wrapper = document.createElement('div');
    wrapper.innerHTML = cell.text;
    var parts = cell.text.split(wrapper.innerText);
    if (parts.length == 2)
      cell.text = `${parts[0]}<a href="${urlList[data.member.caption]}" class='link' onclick='preventExpand(event)'>${wrapper.innerText}</a>${parts[1]}`;
    else cell.text = `<a href="${urlList[data.member.caption]}" class='link' onclick='preventExpand(event)'>${wrapper.innerText}</a>`;
    console.log(data.recordId);
  } else if (data.isDrillThrough && data.type != "header" && data.hierarchy && data.hierarchy.uniqueName == "Country") {
    cell.style['z-index'] = 1;
    cell.text = `<a href="${urlList[data.label]}" class='link' onclick='preventExpand(event)'>${data.label}</a>`;
    console.log(data);
  }
});

function preventExpand(e) {
  e.stopImmediatePropagation();
}

function getData() {
  return [{
      "Country": "Mexico",
      "CountryId": 1,
     ...