PEP 621 doesn't seem supported any more either > This PEP is a historical document. The up-to-date, canonical spec, pyproject.toml specification, is maintained

PEP 621 doesn't seem supported any more either > This PEP is a historical document. The up-to-date, canonical spec, pyproject.toml specification, is maintained on the PyPA specs page. I'd be fine if it supported it, but then PyPA should push to standardize on Poetry.