Wish Text to Speech for minority languages

I noticed that there is a Google-developed, cloud-based, text-to-speech library and B4x code wrapping it. A good start.

I want to do text-to-speech for Narak, a tonal language spoken in the highlands of Papua New Guinea. What are my chances? Does this system support that kind of thing?

P.S. Apologies for reposting this from elsewhere in the forum. Once posted I couldn't move it here.