Как добавить HTML код из cardsData (на сервере) на HTML страницу?

Как добавить часть HTML кода, что хранится в переменной cardsData в index.html?

const express = require('express');
const path = require('path');
const app = express();
const server = require('http').Server(app);
const fetch = require("node-fetch");
const jsdom = require("jsdom");
const { JSDOM } = jsdom;

//БД
const url = 'https://reqres.in/api/users';

//инициализация глобального окружения
global.document = new JSDOM(this.html).window.document;
global.window = new JSDOM(this.html).window;

var cardsData;


async function getCards() {
    await fetch('https://reqres.in/api/users')
    .then(response => response.json())
    .then(json => {
        cardsData = json.data.map(el => {
            return `
                <div class="col col--hidden" >
                    <div class="card">
                        <img src="${el.avatar}" class="card-img-top"  width="200" height="200" alt="...">
                        <div class="card-body">
                            <h5 class="card-title">${el.first_name} ${el.last_name}</h5>
                            <p class="card-text">${el.email}</p>
                        </div>
                    </div>
                </div>
            `;
        });
    });
}

app.get('/', (req, res) => {
    res.sendFile(path.resolve('index.html'));
    getCards();
});

server.listen(3000, (err) =>{
    if(err){
        throw Error(err);
    }
    console.log('Server is runnig');
});

index.html

<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.0.2/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-EVSTQN3/azprG1Anm3QDgpJLIm9Nao0Yz1ztcQTwFspd3yD65VohhpuuCOmLASjC" crossorigin="anonymous">
    <title>Business Cards</title>
</head>
<body>
    <nav class="navbar navbar-light bg-light">
        <div class="container-fluid">
          <span class="navbar-brand mb-0 h1">Business Cards</span>
        </div>
    </nav>
    
    <div class="card-group justify-content-center">
        <div id="cards" class="row row-cols-2 row-cols-md-3"></div>
    </div>
    <a href="#" id="loadMore" class="loadMore"> Load More </a>

    <footer>
        <div class="text-center p-4" style="background-color: rgba(0, 0, 0, 0.05);">
            © Nimchenko Anastasiya 2021
        </div>
    </footer>
    
    <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script>
    <script>
        $( document ).ready(function() {
            $(function(){
                $("#loadMore").on('click', function(e){
                    e.preventDefault();
                    $(".col--hidden").slice(0,3).slideDown().removeClass('col--hidden');

                    $(this).toggle();
                })})
        });
    </script>
   
</body>
</html>