If you're OK with installing third party binary dependencies, then for ripgrep, just download the deb: https://github.com/BurntSushi/ripgrep/releases … (This is pretty much what you sign up for when you use Debian. If you want bleeding edge or a more liberal packaging policy, use a different distro.)
For ripgrep, which is written in Rust, there is considerable work to be done to get Rust tools packaged in a way that the Debian people are happy. AIUI, people are working on this, but it's a lot of work.