Text to Speech in browser - Get voice like Siri/Google

I am developing a web app which will need to convert given text(1000+ chars) into speech. I was going to use Google translate but that has the limit of 100 chars.

I have tried HTML5 SpeechSynthesis but it has a weird male voice (I guess it's using OS' voice). So basically I need a voice like Siri or Google (OK Google type). Is there any way to do this?