Thanks for the links! I hope the proposal works out. I skimmed through the doc, and one thing i’d suggest is to consider using the CPS format rather than the ABOUT one for the metadata. The format is driven by Kitware, the developers of cmake, and thus if it’s contributed to them, a big chunk of the cpp ecosystem would get buy-in just because of the intertia of using cmake, and getting it for free with the tool.

https://cps-org.github.io/cps/overview.html

I’m not sure how I can help, but I’m open for discussion, because the company i work for is also interested in how to handle this well for our products.