JSFiddle - React, Tailwind, and code Playground

HTML

<span class="foo1">
 <span class="intro"><span class="bar">data I need to change</span>
 <span>...</span>
 <div class="body">This is the only place I can write code on the page</div>
</span>

JavaScript

$('.foo1>.intro>.bar').text('Data Changed!');