Have you worked with non-technical teams, ever? Perhaps in teams of very young and gamer-type people this would work, but in any real world team I've been in, this would not in fact be easy unless there's a real time preview and a button you can click that auto-generates that snippet. People would forget the exclamation mark, mixup the brackets with the parenthesis, not know how to reference the right path to the image, and ask a developer to help them out.