How to list keys in `--group` using `kreadconfig6`?

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I’d like to use what Revision - Ask Ubuntu describes

kwriteconfig6 --file kdeglobals --group KDE --key widgetStyle Breeze

to ascertain what kcm_color sets (instead of what kcm_style does). However,

kreadconfig6 --file kdeglobals --group KDE

doesn’t return a list of keys, so I have no idea of what to poll (--key colorScheme doesn’t return anything).

Does anything like Revision - Unix & Linux Stack Exchange exist?