It doesn’t exist in Rocky 9 either. Last version to have hplip-gui was Rocky 8. The same situation with RHEL9 and RHEL10 as well.
It would require building it yourself, or perhaps asking if someone at EPEL would build it. As you can see here: https://pkgs.org/search/?q=hplip-gui it doesn’t exist for any EL9 or EL10 variants (Alma for example).
How to make a request to add to EPEL: Requesting a new package in EPEL :: Fedora Docs
The other alternative if you know how to build packages, is grab a source RPM from Fedora, and build hplip-gui yourself with mock of a post that I wrote on this forum: Install recent HPLIP with GUI on Rocky Linux 8.x and 9.x - #2 by iwalker you can use my instructions there and adapt it for Rocky 10.