On a RPi 4b, I did a test install of SWAY. Of course LightDM did not work on it. I believe I read on a github page somewhere that Lightdm required X11 and Wayland was not officially supported.
So First I tried sddm, and it works. Works very well as KDE Plasma has sort of kind of Wayland support. So I thought, who better to support both x11 and Wayland than Fedora.
I installed GDM, enabled it, then reboot. GDM came up and I simply entered the password.
SURPRISE!!! A very base Gnome 41 came up in all it’s Gnomish glory.
I logged out, and at GDM after clicking on the username, the window with the “gear” in the lower right appeared. Clicking on it brought up:
GNOME on Xorg
With the dot next to GNOME. I then tried all three possibilities and they all worked.
Installing GDM brought in a lot of additional packages, I assume just enough to make Gnome work.