So in other words I shouldn't hold my breath for this to appear on NuGet. That's a shame. It seems like it would play nicely with MarkDown.
I fired off an email to the team responsible. :)
Please post over on https://wpdev.uservoice.com/ and get others to upvote! If internal and external asks line up, it becomes much easier to argue in favor of doing a feature.
Unfortunately not! I am wondering if I should make requests to the Windows team internally, the Managed wrapper class they ship has the math features compiled out. :( I'm in Office, where we use an internal UWP safe C++ version of Rich Edit. We bundle it with our AppX and load it up like any other C++ DLL.