The table at https://getsol.us/articles/configuration/configuring-keyboard-layout/en/ doesn't list the ibus-libzhuyin package. Presumably, this is what the "Zhuyin" entry should be.

It also doesn't indicate that both ibus-chewing and ibus-libzhuyin packages can be used not just for bopomofo/zhuyin input, but also pinyin input (via the respective package's (non-default) "hanyu" option), which is an important detail since pinyin is (I believe) the most popular method of inputting Chinese.