Can you have it work with pipfiles too ?
https://github.com/pypa/pipfile "This format is still under active design and development", last commit "2 years ago". I think this is dead.
Pipenv was last updated 10 hours ago. Looks like it's still an active project to me.
But in any case, I'd vastly prefer the standard pyproject.toml over some file specific to mostly one tool.
> This repository contains the design specification of the Pipfile format, as well as a proposed implementation of a parser for the specification which can be used by Pipenv and, in the future, any other consumer (e.g. pip)
It should probably be updated to reflect whatever the current status and goals are.
I have no idea how well it works.