JSFiddle - React, Tailwind, and code Playground

HTML

<div>
  <p>1</p>
</div>

<div>
  <p>1</p>
  <p>2</p>
</div>

JavaScript

$('div').each(function () {
    var elm= $(this).find('p').eq(1);
    if(elm.length==0)
    {
        $(this).find('p').after('test');
    }
    else
    {
        elm.html('test')
    }
});