JSFiddle - React, Tailwind, and code Playground

HTML

<select>
    <option>test1</option>
    <option>test2</option>
    <option>test3</option>
    <option>test4</option>
    <option>test5</option>
</select>

JavaScript

$('option:nth-child(n+1)').wrapAll('<optgroup  label="Urgent Reasons">');
$('option:nth-child(n+4)').wrapAll('<optgroup  label="Urgent Reasons">');