How to use Apple SpeechSynthesis AudioUnit with AudioKit?

I was reading the book "Learning core audio". Then, I found this awesome library called AudioKit. :-) Everything works great until I want to use Apple SpeechSynthesis AudioUnit.

I searched through github repo, but I cannot find an AKNode for Speech Synthesis . Did I missing something?

I found some swift examples from searching kAudioUnitSubType_SpeechSynthesis on github

So I have two questions now:

1. How to add an Apple AudioUnit Node into AudioKit Graph?
2. Is there a reason that AudioKit doesn't support Speech Synthesis Node? Will AudioKit accept a PR for this?

I would love to have a speech synthesizer in AudioKit, but as far as I know Apple doesn't let you hook it up to an audio processing graph. However, if you do figure out how to make it work, the whole AudioKit core team would be delighted. We would definitely accept a PR.