API Integration Specialist

I am creating an app in which normal call will be done and user who is disabled need to write a message, api will convert this text message to voice during the call. We need to use exisiting api for this. I have searched below api which i think can be used.

https://developer.vonage.com/en/voice/voice-api/code-snippets/controlling-media/play-text-to-speech-into-a-call