can any one tell how to implement this text to speech button in answers ?

Question

https://www.hongkiat.com/blog/text-to-speech/

Answer 1

Amazon Polly is one of the best service for text to speech conversion(human like). You will need Amazon AWS account to access Polly API.

They do have a wordpess plugin, you can look into this plugin code and write plugin for q2a.

Hope this info helps you.