@Kage-Yami Thanks. Updated.

I believe this is missing python-setuptools as a makedepends; getting an error when building in a clean chroot (I'm using Paru, but I believe under the hood it's using the official chroot building scripts from devtools):

==> Starting build()...
* Getting build dependencies for wheel...

Traceback (most recent call last):
  File "/usr/lib/python3.13/site-packages/pyproject_hooks/_impl.py", line 402, in _call_hook
    raise BackendUnavailable(
    ...<4 lines>...
    )
pyproject_hooks._impl.BackendUnavailable: Cannot import 'setuptools.build_meta'

ERROR Backend 'setuptools.build_meta' is not available.
==> ERROR: A failure occurred in build().
    Aborting...
==> ERROR: Build failed, check /var/lib/aurbuild/x86_64/yami/build
error: failed to build 'python-imagebackup-0.2.1-1': failed to run: makechrootpkg -r /var/lib/aurbuild/x86_64 -D /opt/aur -d /var/cache/pacman/pkg/ -- -feA --noconfirm --noprepare --holdver:
error: packages failed to build: python-imagebackup-0.2.1-1

EDIT: have actually tested it now, and yep, just adding python-setuptools to the makedepends makes the build succeed.