We can use several heuristics to detect a license, in this order:

• Use the identify[license] package to scan likely files at root like LICENSE and LICENSE.md etc.
  https://pypi.org/project/identify/
  identify.license_id('LICENSE')
• using pyproject.toml in the project.license field
• using pyprojec.toml in the project.classifiers e.g. "License :: OSI Approved :: MIT License"

We should display using the SPDX format https://spdx.org/licenses/