Dependency bounds using "or"

[NicolasT]

I have a project which depends on the importlib-metadata package. In pyproject.toml, this dependency is specified using

importlib-metadata = {version = "^3.7.3", python = "< 3.8"}

I.e., pointing to the latest release of the package (or compatible).

I'd like to package the package as an RPM for CentOS 8 (+ EPEL), where importlib-metadata ^3.7.3 is not available, but 0.23 is. I have a nox session which tests whether my code works with 0.23 (it does), so now I'd like to specify in pyproject.toml the package works with ==0.23 || ^3.7.3. This seems to be needed because if I simply keep ^3.7.3 the CLI entry-point fails to load when running on CentOS 8 (when python3-importlib-metadata, i.e. version 0.23 is installed):

DistributionNotFound: The 'importlib-metadata<4.0.0,>=3.7.3' distribution was not found and is required by gptsum.

However, I can't figure out how to specify these 'or' version bounds properly, and for them to be accepted by all pieces of the stack (i.e., Poetry, Setuptools, Pip,...).

PEP440 doesn't really bring much hope...

Is this possible at all?