Comment by neobrain

Given that you're already using Home Manager: Make sure to also take a look at plasma-manager! [1]

It extends HM's declarative config to KDE/Plasma's config files, which are harder to manage since they also contain volatile state like window geometry. For discovery, there is also a `plasma-manager` executable that prints out most (all?) active settings. In particular the keybindings are included in there.

(This doesn't directly answer your question, but maybe is informative regardless and/or helpful for finding related options)

[1] https://github.com/nix-community/plasma-manager