Please consider packaging version 8.0.1 released 2021-07-03 https://github.com/fmtlib/fmt/releases/tag/8.0.1
Already long in tree: https://gitweb.gentoo.org/repo/gentoo.git/commit/dev-libs/libfmt?id=a77f132684680629b2a96127693c78d92f20f5a4