Customizing Email Notifications in Microsoft Bookings

I am seeking guidance on the following aspects of Microsoft Bookings:

1. Email Dispatch Mechanism: How Microsoft Bookings sends emails to clients (appointment confirmation, before-meeting email, after-meeting email)? Under the hood, does it utilize Microsoft Graph to schedule and send these emails?
2. Custom Email Templates: I aim to bypass the default email notifications and implement customized templates for client communications. Is it possible to disable the standard email-sending feature in Microsoft Bookings and instead trigger my custom email workflow, perhaps using Microsoft Graph or another method?