I was confused about your comment at first - I was sure it was already a feature where you could use ```X to render the contents with a language. E.g. you could

I was confused about your comment at first - I was sure it was already a feature where you could use ```X to render the contents with a language. E.g. you could go ```java or ```javascript and get syntax highlighting for that language. What you're saying is since ```mermaid now renders a mermaid diagram, there isn't a way to display a block of raw mermaid code with syntax highlighting. That's a very valid point.