Locale keymaps for physical keyboards
Citing https://xnux.eu/pinephone-keyboard/faq.html:
Locale based keymaps (like Czech, US, Russian), are handled at application level,
like on any normal desktop Linux distributions.
I don't know if Phosh or Plasma Mobile offer GUI to add these locale keymaps for physical keyboards,
but they definitely should!
File bug reports (or find and track existing ones) with your distribution if this is not easily available.
Following this advice, here is feature request:
Pinephone can have physical keyboard. Locale keymaps should either follow options for virtual keyboard (if i set language for virtual keyboard should follow), or there should be additional settings for physical keyboards, because as of now, it's not possible to write any regional letters on physical keyboard.