I have a Japanese laptop & run Manjaro Gnome & frequently use both langs. Fcitx5 Mozc is the best way to go.
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In Settings set your KB input source to Japanese. This ensures the printed symbols such as @ will be on the correct keys when you are using English.
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Open Add/Remove Software & search for ‘fcitx5’ & Install the following 6 items
- manjaro-asian-input-support-fcitx5
- fcitx5
- fcitx5-gtk
- fcitx5-qt
- fcitx5-mozc
- fcitx5-configtool
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In your Apps > System Tools open the Fcitx5 Configuration Tool.
& Set your Inputs to:- Keyboard - Japanese
- Mozc
You can now use the Zenkaku key 半角/全角 (under esc) to change between hiragana & english.
Muhenkan 無変換 to change to Katakana. & in the settings you can set up the other kana keys as you require.