Japanese kana screen keyboard layout I've found out how to switch between romaji with QWERTY and keitai-style flick keyboard, but I'd like to have ordinary kana layout similar to PC and Mac:





Is it possible with GBoard, or do I need a third-party keyboard app?
Unfortunately, as of the latest version (8.0.5), GBoard only supports 4 variants for Japanese keyboard: 12 keys, QWERTY, Handwriting, and GODAN. The QWERTY variant also only supports romaji input, not kana layout.
The current solution is to use 3rd-party keyboard apps, and while I have browsed some kana/JIS keyboard apps, the only keyboard app that I could recommend for now is:

Japanese Full Keyboard For Tablet by Repy (freemium)





The keyboard supports 3 keymaps: JP109, US, and JP KANA. After selecting JP KANA keymap, the kana mode can be toggled by pressing the 全 key on the top-left.
While the name mentioned &quot;Tablet&quot;, it's also working on the phone. However, since the layout tries to follow the physical keyboard layout, the size and the position of some keys may not be optimum for a smaller screen.
Based on a quick test, the keyboard is quite comfortable on a 5&quot; screen while on landscape mode, though on portrait mode the keys are a bit too squished. Fortunately, the settings allow changing the height of the key, so it's still bearable on portrait mode.