Enter characters using the Kana Table on Mac
You can enter hiragana, katakana, and romaji by using the Kana Table instead of the keyboard.
In an app on your Mac, set up and switch to a Japanese input source.
Click the Input menu in the menu bar, then choose Type Using Kana Table.
In the Kana Table, click the あ (hiragana), ア (katakana), or A (romaji) tab.
Click the character you want to enter.