JSFiddle - React, Tailwind, and code Playground

HTML

<textarea id="ta">I want to tag #thisperson</textarea>
<div>
  <ul id="choices">
    <li>PersonA</li>
    <li>PersonB</li>
    <li>PersonC</li>
  </ul>
</div>

JavaScript

$(function(){
	$("#choices li").click(function(){
  	var name = $(this).text();
    $("#ta").val($("#ta").val().replace("#thisperson", name));
  })
})