`Set the prompt to be shown'
When asking for a PIN, set the text just before the widget for
passphrase entry.
C: SETPROMPT PIN:
S: OK
You should use an underscore in the text only if you known that a
modern version of pinentry is used. Modern versions underline the
next character after the underscore and use the first such
underlined character as a keyboard accelerator. Use a double
underscore to escape an underscore.
From the protocol
pinentry-rofi
currently does not handle this.