See this page: 2059773 – Please branch and build xorg-x11-font-utils in epel9 in particular:
maybe it’s just enough to install mkfontscale:
[root@rocky9 ~]# dnf search mkfontscale
Last metadata expiration check: 2:21:48 ago on Sat 03 Sep 2022 03:07:39 PM CEST.
====================== Name Exactly Matched: mkfontscale =======================
mkfontscale.x86_64 : Tool to generate legacy X11 font system index files
In Rocky8 the xorg-x11-font-utils exists, so since you didn’t mention which version of Rocky, assumed you mean Rocky9 as it doesn’t have that package.