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This is a great Jarvis voice..
Using Tasker you could easily read out whatever speech you want into a wave file. Then it's just the work of naming/importing into the Taranis...it's on my list of things to do...eventually...when I have lots of time.
It would be easier to do in windows but the voice license is quite a bit more expensive.
I've used this before and really liked the output - but as of late, it isn't getting used by my reading app despite being the default TTS engine:
Which reading app do you use?
you can download different voice engines, some are much better than the default and not robotic.
this one sounds the most natural while reading ebooks
Those are paid bust are the best ones i found, i own those three.
The first one is incredible natural sounding
I love William. Here is a link