JSFiddle - React, Tailwind, and code Playground

HTML

<ul id="hello">
    <li>.....</li>
    <li>.....</li>
    <li>.....</li>
    <li>.....</li>
    <li>.....</li>
    <li>.....</li>
</ul>

JavaScript

$('#hello li:first').append('<label>The First item</label><br>');
$('#hello').find('li:first').append('<label>The First item</label><br>');
$('<label>The First item</label><br>').appendTo($('#hello').find('li:first'));