For new projects this would indeed be nice. The full spec is in a google spread sheet here.
It is some work to set them, so I do not have time for this this year.
If you volunteer to edit the labels there, I can give you permissions on the collective organization.
Setting those labels on the organisation level of Github has no effect on existing repositories, just on new ones.
To set those on existing repos, I created a quick and dirty here script https://github.com/plone/plone.github/