Is it similar to [Linux on Chromebook] Anki 25.07.5 crashes with Wayland error immediately after starting - #4 by Anon_0000?
I found a guide which might help further: Installing Anki on a Chromebook. I never used linux inside of ChromeOS though, only “standard” linux (mostly Debian).
Running the anki flatpak via terminal could help identify the issue.
You can check their docs: Linux setup | ChromeOS.dev.
But it seems to be just like any other debian distro. E.g. to resolve the libatomic.so issue you had from above, you’d run something along the lines of this:
sudo apt install libatomic1