well, with enough time and energy, you can implement almost anything :-)
The only drawback I see is that if we're adding some custom handlebar functions to do this is that then the markdown file itself will get less readable, i.e. when you view it in a text editor (or on github). What we could do though is implement this in Javascript and run it on the client side. Bascially intercept the ajax response and print it on screen somewhere.
It's not very pretty, I know. An implementation idea for intercepting the http response would be to splice some ajaxGridOptions handler into the text read from the codetag. It's a bit of a hack of course, so if you know a cleaner way to do this go right ahead :-)
As per @flack's comments in pull #17.