JSFiddle - React, Tailwind, and code Playground

HTML

<a href="#" class="comment-nickname">Ник</a>
<form>
    <textarea id="comment-text"></textarea>
</form>

JavaScript

$('.comment-nickname').on('click', function(){
    var $commentTxt = $('#comment-text');
    $commentTxt.val( $commentTxt.val() + $(this).text() + ', ' );
    $commentTxt.focus();
    
    return false;
})