How to inject a Python package dependency from nixpkgs?

[tesujimath]

I am trying to use the output of a dream2nix built Python package along with some native nixpkgs Python packages.

It is failing because of duplicated instances of typing-extensions, since dream2nix has fetched one from PyPI which conflicts with the native nixpkgs one.

I have attempted to inject the nixpkgs version of typing-extensions for the packages which depend on it, like this in my default.nix:

  pip = rec {
    overrides =
      {
        alembic = {
          mkDerivation.propagatedBuildInputs = [
            config.deps.python3Packages.typing-extensions
          ];
        };

        sqlalchemy = {
          mkDerivation.propagatedBuildInputs = [
            config.deps.python3Packages.typing-extensions
          ];
        };
    };
  };

I checked the dream2nix lock file and there were no other packages depending on typing-extensions.

However, this seems to introduce the nixpkgs version of typing-extensions as an additional dependency. I can't work out how to not include the one from PyPI. Certainly the lock file refresh still fetches the PyPI version of typing-extensions.

My error message on nix build is this:

it23699> nix build
warning: Git tree '/home/guestsi/vc/agr-github/redun.nix' is dirty
error: builder for '/nix/store/j2b4q23hj9k62r84f93fkxzpbmnmyq2r-python3.12-sqlalchemy-2.0.41.drv' failed with exit code 1;
       last 25 log lines:
       >           PosixPath('/nix/store/srby6wmvg7dp454pwb6qvaxdiri38sc1-zlib-1.3.1/lib'),
       >           PosixPath('/nix/store/d52qvak789g813n4nb8ghlsvi2r2yifh-python3.12-typing-extensions-4.13.2/lib'),
       >           PosixPath('/nix/store/lq3i7vyrj2hnqwbvphsfrgaifqjprmpz-python3.12-greenlet-3.2.2/lib'),
       >           PosixPath('/nix/store/jlc4i1v2xk855jr7r4rip0126gwmpl9i-python3.12-typing-extensions-4.13.2/lib'),
       >           PosixPath('/nix/store/lq3i7vyrj2hnqwbvphsfrgaifqjprmpz-python3.12-greenlet-3.2.2/lib/python3.12/site-packages/greenlet'),
       >           PosixPath('/nix/store/lq3i7vyrj2hnqwbvphsfrgaifqjprmpz-python3.12-greenlet-3.2.2/lib/python3.12/site-packages/greenlet/tests'),
       >           PosixPath('/nix/store/8w718rm43x7z73xhw9d6vh8s4snrq67h-python3-3.12.10/lib/python3.12/lib-dynload'),
       >           PosixPath('/nix/store/8w718rm43x7z73xhw9d6vh8s4snrq67h-python3-3.12.10/lib')],
       >  'paths': [PosixPath('/nix/store/d60rp129dayxsvbh0j4m7ka9d8yg850c-python3.12-sqlalchemy-2.0.41'),
       >            PosixPath('/nix/store/00j1qj6mcgj27srisrzq5h2283vjj86a-python3.12-sqlalchemy-2.0.41-dist')],
       >  'recursive': True,
       >  'runtime_dependencies': []}
       > auto-patchelf: 0 dependencies could not be satisfied
       > Running phase: pythonCatchConflictsPhase
       > Found duplicated packages in closure for dependency 'typing_extensions':
       >   typing_extensions 4.13.2 (/nix/store/d52qvak789g813n4nb8ghlsvi2r2yifh-python3.12-typing-extensions-4.13.2)
       >     dependency chain:
       >       this derivation: /nix/store/d60rp129dayxsvbh0j4m7ka9d8yg850c-python3.12-sqlalchemy-2.0.41
       >       ...depending on: /nix/store/d52qvak789g813n4nb8ghlsvi2r2yifh-python3.12-typing-extensions-4.13.2
       >   typing_extensions 4.13.2 (/nix/store/jlc4i1v2xk855jr7r4rip0126gwmpl9i-python3.12-typing-extensions-4.13.2)
       >     dependency chain:
       >       this derivation: /nix/store/d60rp129dayxsvbh0j4m7ka9d8yg850c-python3.12-sqlalchemy-2.0.41
       >       ...depending on: /nix/store/jlc4i1v2xk855jr7r4rip0126gwmpl9i-python3.12-typing-extensions-4.13.2
       >
       > Package duplicates found in closure, see above. Usually this happens if two packages depend on different version of the same dependency.
       For full logs, run 'nix log /nix/store/j2b4q23hj9k62r84f93fkxzpbmnmyq2r-python3.12-sqlalchemy-2.0.41.drv'.
error: 1 dependencies of derivation '/nix/store/484p64mf01hd7yb9yf465bawd17lvj3j-python3.12-redun-0.26.0.drv' failed to build

This seems to be such an obvious thing to want to do, and I have seen questions along these lines, but no answers.

Is this addressed in dream2nix, or does it not play nicely alongside native nixpkgs Python packages?