I tried Android Auto, and the assistant said, No. Viewing emails disabled while driving.
I asked the assistant in Android Auto to Read My Email - and the reply was Viewing Emails Disabled While Driving.They want AA to *read* the emails, not display the contents on the screen.
It's not Google Assistant, but you could try using TalkBack; however, that also makes it a bit of a pain to navigate around the phone: https://support.google.com/mail/answer/6115187?co=GENIE.Platform=Android&hl=en
Speaking of TalkBack, what the heck is an "TalkBack screen reader: Get spoken feedback, control your device with gestures, and type with the on-screen braille keyboard."
How does that even work?
https://play.google.com/store/apps/details?id=com.google.android.marvin.talkback
I've wondered that before as well. Here's more info: https://www.blog.google/products/android/braille-keyboard/
I'm not sure if it still requires some degree of vision to use, or if it will vibrate under your fingers when they're touching the spots.
Speaking of TalkBack, what the heck is an "TalkBack screen reader: Get spoken feedback, control your device with gestures, and type with the on-screen braille keyboard."
How does that even work?
https://play.google.com/store/apps/details?id=com.google.android.marvin.talkback