16CharactersWork if you're submitting a cleanup or update for an existing package in main just do a PR for it. If you intend to take a package from the above list I think it would be better to mention here that you're going to take it so nobody wastes time packaging the same thing (within reason, if someone says they're taking a package but doesn't submit a PR within a few days I would say it goes up for grabs again).
You can post any questions/issues with packaging here on the forums or for more interactive help most of the development is being coordinated through the Matrix channels and you can ask there.