Nix also has a Guix service itself[^1], if you want to do the same in reverse ;)
I love that this goes both ways. What other pair of Linux distros mutually offer first class support for using each other's package managers alongside their own??
It's a cute little testament to the fundamental strengths of the functional package management paradigm, as well as helping users on either side of the fence fill some gaps in a pinch and providing more/easier opportunities to compare notes and inspire improvements.
[0] https://guix.gnu.org/manual/en/html_node/Miscellaneous-Servi...