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You can already do soft proofing and use ICC profiles in GIMP. There are also plugins. And seems like more CMYK features are under development.
https://docs.gimp.org/3.2/en/gimp-prefs-color-management.html
https://wiki.archlinux.org/title/GIMP/CMYK_support
https://www.phoronix.com/news/GIMP-Post-3.2-Features
https://developer.gimp.org/core/roadmap/
3.4: High-end CMYK support