Disabling autocomplete per booking form field

I have a situation where something in my browser (which I can’t find) is forcing an autocomplete for my email address when I’m booking appointments for clients who call. This replaces the client’s email address

As such, I’d like to resolve the issue by having the code for the booking page add autocomplete=off as shown here:

<form autocomplete="off">
  <!-- form fields here -->

Is this possible? If not, it is a formal feature request.