An AI that turns email conversations into WhatsApp texts

Let me explain.

I can easily answer 300 WhatsApp texts in a day. But writing 300 emails is exhausting.

I would like an AI that lets me sign in with Google and turns all my email conversations into WhatsApp-like chats.

It would work like this:
1. I get an email
2. The AI compresses the contents of the email into a short chat message
3. I reply with another short chat message
4. The AI turns it into a long form email reply and sends it

For outgoing email sent from scratch, it should let me add stylistic instructions like "Tone: casual" or "Context: minimal".

This would boost my email productivity 10x or more.