Not sure if you can answer this question, but I've tried Markdown in the past with Joplin and one of the issues I had with it was that the codeblocks don't have a convenient copy button. It separates them out nicely but you still have to highlight to copy and paste.

Maybe I'm doing something wrong, but as far as I could tell, this seemed like a shortcoming of Markdown itself, but is that something helix is able to do? It's the one thing that's got me on AnyType over any other note app, but I'm heavily under utilizing it for what it could be good for.