there's no way for you to do it at the moment, but if you paste the image here I can add it for you in the meantime! (please reply to this post so I get the notification)
Boop. I'm going to assume you didn't get notified of OP's reply below. So here's a ping, hope you don't mind :p
Hey! Thanks @null! Just posted the promo image in this thread... Re-posting in this reply: