When you're using a third party repository on your Ubuntu or Debian system and need to find out which packages are available in this repo and which versions, you can consult the local apt cache.
In /var/lib/apt/lists you'll find a lot of *_Packages files that list the contents of apt repositories. Most repositories will have one file for the i386 architecture and one for the amd64 architecture. Make sure to pick the correct one.
To list the contents of the repository, view the respective files or, for a short summary:
/var/lib/apt/lists $ grep -E "(Package|Version)" ppa.launchpadcontent.net_git-core_ppa_ubuntu_dists_jammy_main_binary-amd64_Packages | paste - - | column -t
Package: git Version: 1:2.41.0-0ppa1~ubuntu22.04.1
Package: git-all Version: 1:2.41.0-0ppa1~ubuntu22.04.1
Package: git-cvs Version: 1:2.41.0-0ppa1~ubuntu22.04.1
Package: git-daemon-run Version: 1:2.41.0-0ppa1~ubuntu22.04.1
Package: git-daemon-sysvinit Version: 1:2.41.0-0ppa1~ubuntu22.04.1
Package: git-doc Version: 1:2.41.0-0ppa1~ubuntu22.04.1
Package: git-email Version: 1:2.41.0-0ppa1~ubuntu22.04.1
Package: git-gui Version: 1:2.41.0-0ppa1~ubuntu22.04.1
Package: git-man Version: 1:2.41.0-0ppa1~ubuntu22.04.1
Package: git-mediawiki Version: 1:2.41.0-0ppa1~ubuntu22.04.1
Package: git-svn Version: 1:2.41.0-0ppa1~ubuntu22.04.1
Package: gitk Version: 1:2.41.0-0ppa1~ubuntu22.04.1
Package: gitweb Version: 1:2.41.0-0ppa1~ubuntu22.04.1
