<textarea id="mensagem"></textarea>
<button onclick="requisitar()">Requisitar</button>
<script src="https://code.jquery.com/jquery-3.6.1.min.js" integrity="sha256-o88AwQnZB+VDvE9tvIXrMQaPlFFSUTR+nldQm1LuPXQ=" crossorigin="anonymous"></script>
url:"@Url.Content("~/Home/Requisitar")",
document.getElementById("mensagem") . value = msg;