ow do I set up an email account on my WiFi cellular Apple Watch four, if I don’t have a compatible cellular plan?

How do I set up an email account on my WiFi cellular Apple Watch four, if I don’t have a compatible cellular plan? My phone is showing my watch as a Bluetooth device, but my watch isn’t showing my phone as a Bluetooth device. Compatible apps have synced to the watch.

[Re-Titled by Moderator]