JSFiddle - React, Tailwind, and code Playground

HTML

<div class="list">
    <dl>
        <dd>First dd</dd>
        <dd>Second dd</dd>
        <dd>Third dd</dd>
    </dl>
    <ul>
        <li>First li</li>
        <li>Second li</li>
        <li>Third li</li>
    </ul>
</div>

JavaScript

$('.list').find( 'dd:not(:last-child), li:not(:last-child)' )
    .after(' yeay!');