command line retrieve list of kbd layouts and variants (to use with setxkbmap)

[Giuseppe Penone]

Hi, is there a way from command line to retrieve the list of all available
keyboard layouts and relative variants?

I need to list all the available layout/variants choices to be used then
from setxkbmap.

Also about the layout toggle options, is there a way to retrieve a list of
all available choices
(e.g. grp:shift_caps_toggle , ...)

Regards,
Giuseppe.
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