permanently adding driver to Debian live USB stick

[Adam Weremczuk <adamw@matrixscience.com>]

Hi all,

My Deb 11.5 live bootable USB stick is missing a driver for Intel 
Wireless-AC 9560 adapter.

Intel provides a link to the missing firmware: 
https://www.intel.com/content/www/us/en/support/articles/000005511/wireless.html

and instruct to copy files (iwlwifi-9000-pu-b0-jf-b0-34.ucode in this 
case) to /lib/firmware which is nowhere to be found on the USB stick.

The directory structure looks like below:

(f) autorun.ico
(f) autorun.inf
(d) boot
(d) d-i
(d) dists
(d) EFI
(d) isolinux
(d) live
(d) pool
(f) syslinux.cfg

Is there a way of permanently including the firmware file so that the 
WiFi automatically becomes operational every time I boot Debian live?

Regards,
Adam