Integration with Speechify / NaturalReader for better TTS

The TTS voices available on Speechify / NaturalReader are more natural sounding than any of the default voices available in iOS. Not to mention that both have added AI capabilities that are better at skipping footnotes, tables etc. It would be great if there some form of reading progress integration with either Speechify or NaturalReader so we could go between the two. Speechify also offers an API if that’s an easier way to go with integrating a service.