JSFiddle - React, Tailwind, and code Playground

HTML

<form class="myForm">
    <table>
        <tr>
            <td>
                <textarea name="name"></textarea>
            </td>
        </tr>
    </table>
</form>
<button>click me</button>

JavaScript

$(document).ready(function () {
    $(document).on('click', 'button', function (event) {
        $(".myForm td textarea[name='name']").val('Hello World!');
    });
});