Amazon Polly - Additional Voice Engines

[dXgVQrYz]

The software currently only lists voices from Amazon Polly's "standard" voice engine. I'm curious to know if there are any future plans to incorporate the additional voice engines: neural, long-form, and generative. In particular, the inclusion of generative voices would be extremely useful as they sound much better than the standard voices and are relatively inexpensive.

https://docs.aws.amazon.com/polly/latest/dg/voice-engines-polly.html