I have submitted the update of this part to the colleague who updated the website, and he may not have uploaded it yet.
But this [0,32] range is a maximum value that libcamara hardcodes to adapt to all cameras.
For the specific range, you can refer to
cat /usr/share/libcamera/ipa/raspberrypi/arducam_64mp.json
You can see that there is a “map” at the end: [0.0, 0 ,15.0,1023], which can be understood as 0,15 corresponds to 0,1023