JSFiddle - React, Tailwind, and code Playground

HTML

<input id="hello" value="testing" name="em_attributes[Details]"/>

JavaScript

$( document ).ready(function() 
    {
        var input=document.getElementsByName("em_attributes[Details]")[0];
        textarea = document.createElement('textarea');
        textarea.id    = input.id;
        textarea.cols  = 55;
        textarea.rows  = 5;
        textarea.value = input.value;
        input.parentNode.replaceChild(textarea, input);
    });