How to add Chinese input method "Cangjie" to Plasma environment?

I am originally using Workstation’s default Gnome environment. Which I managed to add the Chinese Input method via Software “Cangjie” .

After install the Plasma environment, I rebooted and sign-in without issues.

Now, I want to add the Cangjie input method but I have no idea how to do that. This is the first time I am adding Cangjie to Plasma.