After playing around with it a little bit by first generating an IA compatible RSS feed using Jekyll, (Jekyll Feed Layout), I managed to get it ingested into the system.
But looks like there’s still quite a fair bit of caveats.
Custom CSS will not work. Which means, code highlighting syntaxes will not render.
You still have to conform your encoded content to their standards (ref: IA Design Guide).
Hopefully soon though!
Other than that, FB’s IA has been a treat to use over the past year. Love being able to quickly read content without having to load a browser view.