This file is indexed.

/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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default
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

};