JSFiddle - React, Tailwind, and code Playground

HTML

<ul>
    <li><span>Item 1</span><span class="num">30</span></li>
    <li><span>Item 2</span><span class="num">0</span></li>
    <li><span>Item 3</span><span class="num">20</span></li>
</ul>

CSS

li.selected{
color: red;   
}

JavaScript

$(function(){
    $('li').each(function(){
        if( $(this).find('span.num').html() == '0' ) $(this).addClass('selected')
    });
})