The voices (and tech) used in Amazon Alexa, are available for anyone to play with, free of charge - search for Amazon Polly. Here's the voice of "Geraint" (Welsh English) reading Lewis Carroll:
https://www.poetryfoundation.org/poems-and-poets/poems/detail/42916
Try Polly here: https://eu-west-1.console.aws.amazon.com/polly/home/SynthesizeSpeech
https://www.poetryfoundation.org/poems-and-poets/poems/detail/42916
Try Polly here: https://eu-west-1.console.aws.amazon.com/polly/home/SynthesizeSpeech