Google online text to speech

Hi,

Other reading apps like Readera is able to use google's online tts (text-to-speech) AI voices. I love how much more natural it sounds - it seems like the native app is able to use google tts voices, but the online AI voices don't seem to be available. I would love to use the native app on my boox page as my main reader, but this is one thing that is missing that makes me unable to do so. Is there a way to select the google online AI voices as an option in the native app, or add it as an option?