I have created a flatpak repo to hold my copy of Emacs as I have added extra items to the package that would be bloat on Flathub.
Currently the only package avaliable in the repo is Emacs and it is avaliable for x86_64, ARM, and Aarch64.
You can use the following link to install the repo:
flatpak remote-add zoglesby https://
To install emacs:
flatpak install zoglesby org.gnu.Emacs