This extension allows you to use google text-to-speech in your app with realistic voices,many languages and many languages
You can set Language,Voice,SpeakingRate,Pitch.
It is not like normal text-to-speech.
Thanks to @chaimk for sponsoring this extension!
You can get you Free API Key at Google Cloud Console, and on signing up you will also get 300$ credits there.
If you want to do it for free then you may also try to implement it’s API in your app
PayTM - 1000 INR
PayPal - 17.5 USD