JSFiddle - React, Tailwind, and code Playground

HTML

<div id="map"></div>

CSS

</style>
<script type="text/javascript" src="https://api-maps.yandex.ru/2.1/?lang=ru_RU"></script>
<style>
        html, body, #map {
            width: 100%; height: 100%; padding: 0; margin: 0;
        }

JavaScript

ymaps.ready(function () {
    var myMap = new ymaps.Map('map', {
            center: [55.751574, 37.573856],
            zoom: 9
        }, {
            searchControlProvider: 'yandex#search'
        }),
        MyIconContentLayout = ymaps.templateLayoutFactory.createClass('{{properties.iconContentCalculated}}', {
build: function () {
 MyIconContentLayout.superclass.build.call(this);
 if (!this.getData().properties.get('iconContentCalculated')) {
    this.getData().properties.set({iconContentCalculated: this.calculateGeoObjectsSum()});
 }
},
calculateGeoObjectsSum:function () {
  var geoObjects = this.getData().properties.get('geoObjects');
  return geoObjects.reduce(function (value, geoObject, i) {
    return value += geoObject.properties.get('index');
  }, 0);
}
});
        clusterer = new ymaps.Clusterer({
            clusterIconContentLayout: MyIconContentLayout,
        }),
        getPointData = function (index) {
            return {
                index: index,
                balloonContentBody: 'балун <strong>метки ' + index + '</strong>',
                clusterCaption: 'метка <strong>' + index + '</strong>'
            };
        },
        points = [
            [55.831903,37.411961], [55.763338,37.565466], [55.763338,37.565466], [55.744522,37.616378], [55.780898,37.642889], [55.793559,37.435983], [55.800584,37.675638], [55.716733,37.589988], [55.775724,37.560840], [55.822144,37.433781], [55.874170,37.669838], [55.716770,37.482338], [55.780850,37.750210], [55.810906,37.654142], [55.865386,37.713329], [55.847121,37.525797], [55.778655,37.710743], [55.623415,37.717934], [55.863193,37.737000], [55.866770,37.760113], [55.698261,37.730838], [55.633800,37.564769], [55.639996,37.539400], [55.690230,37.405853], [55.775970,37.512900], [55.775777,37.442180], [55.811814,37.440448], [55.751841,37.404853], [55.627303,37.728976], [55.816515,37.597163], [55.664352,37.689397], [55.679195,37.600961], [55.673873,37.658425], [55.681006,37.605126],...