/usr/share/X11/xkb/keycodes/jolla is in xkb-data 2.23.1-1ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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xkb_keycodes "jolla" {
// These keycodes are beyond the X11 255 limit value so it would
// only be valid for the use with SW which supports extended keycodes,
// like xkbcommon.
<I264> = 264; // Jolla phone has the wired headset button sending this keycode
};
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