I created an ebuild for the nov.el emacs package (EPUB reader for Emacs). Homepage: https://depp.brause.cc/nov.el/ I also created an ebuild for the esxml emacs package because it's required by nov.el.
Created attachment 676204 [details] nov-0.3.2.ebuild
Created attachment 676207 [details] esxml-0.3.5.ebuild
I added app-emacs/nov and app-emacs/esxml to my personal Gentoo repository: https://git.sr.ht/~fturco/gentoo