Scan results quality for Python packages: wheel vs. source distributions

While the "License clarity" and "Scan summary" data looks great when using source distributions, the quality of the results when using wheel as inputs could be improved.

For example with https://pypi.org/project/XlsxWriter/3.0.3/#files

- Source: `XlsxWriter-3.0.3.tar.gz`


- Wheel: `XlsxWriter-3.0.3-py3-none-any.whl `


----

When looking at the `LICENSE.txt` and `METADATA` key files of the wheel, it seems that we should be able to get the `Declared license` and `Declared holder` value as we do for the source dist: