Is there a way to load a plugin to MarkdownIt through conf.py?

[eyllanesc]

I see that the MarkdownIt parser loads a predefined list of plugins(colon_fence_plugin, amsmath_plugin, etc) based on the configuration in sphinx(conf.py), but sometimes you want to add custom plugins to MarkdownIt so my question is: How can I do it? since I don't see how to access that object.

[adam-grant-hendry]

@eyllanesc See Issue #632