yochananmarqos [1] filed a request to merge loupe [2] into loupe-git [3]: Creating a "release" package is pointless as Loupe is still in development. It may or may not be ready for GNOME 45. I think loupe- git is good enough for now for those who want to test it.
[1] https://aur.archlinux.org/account/yochananmarqos/ [2] https://aur.archlinux.org/pkgbase/loupe/ [3] https://aur.archlinux.org/pkgbase/loupe-git/