I contacted Robin <robb...@gentoo.org> today asking for how to proceed here, he told me to post here.
tl;dr -> https://bugs.gentoo.org/show_bug.cgi?id=506052 shows that * the former dev has removed himself as maintainer * the package is rather outdated now in portage * there are some ebuilds already which could be considered to be added (at least as unstable, sure) pls advise, thanks, Stefan