Definitely convenient, but I question the need for an ever-changing API for this sort of thing. If you reload the endpoint (which can be done directly in the browser, which I like) the order of the markdown and paragraphs change. So, if I'm testing this when developing, and I want to find the perfect numbered bullet points, I have to scroll around and find them again, each time the API is hit.
It could be argued that I could build something on my own that grabs the result and caches it to make refreshing less jarring, but at that point, why bother with an API at all?