Two hid Joysticks as one

hello ive made a hid joystick using pi pico w
for my ground control station its working fine
but i have another hid joystick (not custom)
i want to use it with my joystick
but when it comes to my gcs software i can use only one hid joystick at once

open not custom joystick and solder wires to controls, connect them to pi pico w

are you saying me to use pio usb? i mean two hid devices merging?

open joystick first, it may be not so easy to get values from controls. take some photos and say why you want this joystick instead of making one just like the first custom one?