Flit-core uses a dependencies block to determine requirements.

https://flit.pypa.io/en/stable/pyproject_toml.html?highlight=dependencies#dependencies

But if you look at utils/setup_reader.py -> read_setup_cfg() it only checks for "python_requires", "install_requires...etc"

Could we add support for other backends?

Also it looks like it's only able to get the requirements from setup.py or setup.cfg, why doesn't it read pyproject.toml?