I tend to use Astroberry as a INDI Server only and runs Ekos/KStars on my desktop indoors (or if I go to a remote site I would use a high-spec Laptop).
Doing EAA with this setup would be as others have specified - copy files to higher spec system and register / live stack there.
Some have looked whether the Astro Live Stacker (ALS) could work with the Pi see -
github.com/gehelem/als
What appears to be limiting here is, as mentioned, the raw processor performance and the memory limitations of the Pi, but it appears some have been using it.
In order to get the most out of this you would probably want the highest spec Pi available (as of writing this is the Pi4 8GB ram).
Also, to take advantage of the 8GB on a per-process basis you would also want to be running the PiOS 64-bit version, which is currently in Beta.
Astroberry is based on PiOS 32-bit.
Maybe wait until the Pi5 is released, when Raspberry Pi OS 64-bit is stable, and maybe when a 64-bit image of Astroberry is available.