Configure link rendering to send a private message

I have activated on my story type "article" the Private message field so that readers can contact the author of an article.

I want to display the link "Send a private message" as a call-to-action button> Can you add in "Manage display" an option to configure the rendering of the link to send a private message, for example the possibility of customizing the class

<div class="private_message_link_wrapper">
    <a href="/private-messages/4" class="private_message_link button button--primary">Envoyer un message privé</a></div>