It's probably not going to happen any time soon — not enough demand relative to other things. How hard is it to render the map on your own system, and then insert an image of that?
Personally, I think that an embedded version of graphviz would be more generally useful.
You can render your code using this website if you add a bit of boilerplate around it:
However, the only output option seems to be PDF, which still leaves you with the task of converting that to an image that can be embedded. There may be other online renderers.