JSFiddle - React, Tailwind, and code Playground
HTML
<ul class="color-this-list">
<li data-color="#000000">EMG</li>
<li data-color="#333333">EMG</li>
<li>EMG</li>
<li data-color="#666666">EMG</li>
<li data-color="#999999">EMG</li>
<li>EMG</li>
<li data-color="#cccccc">EMG</li>
</ul>
JavaScript
$('.color-this-list li').each(function(){
var colour = $(this).data('color') || '#abcdef';
$(this).css('background-color', colour);
});