fcitx5 is the default input method framework on KDE and integrates with KDE system settings and apps on KDE a lot better than IBus. As an example, IBus doesn't work with the flatpak'ed Chrome on Wayland but fcitx had no issues.
Here are the packages that are potentially interesting:
fcitx5
kcm-fcitx5: configuration integration with KDE system settings
fcitx5 is the default input method framework on KDE and integrates with KDE system settings and apps on KDE a lot better than IBus. As an example, IBus doesn't work with the flatpak'ed Chrome on Wayland but fcitx had no issues.
Here are the packages that are potentially interesting: