Hi @sdms. I'm glad to know you're interested in this project.
Just in case you might find it helpful there's another thread from another DocC contributor giving feedback about this feature Experimenting with documentation coverage metrics - a few questions and feedback - #3 by Joseph_Heck.
While the thread is a few years old and some points may no longer be relevant, there could still be valuable insights to consider when planning future enhancements to this tool.
Thanks again for your interest, looking forward to your proposal :)