How to actually use the IMX219 image sensor with MJPG at 3264x2448 resolution?

1.Which seller did you purchase the product(s) from?
2.The Model number of the product(s) you have purchased?
Arducam 4K 8MP IMX219 Autofocus USB Camera Module Without Microphone
3.Which Platform are you using the product(s) on?
Raspberry Pi 4B
4.Which instruction are you following?

5.Has your product ever worked properly?
6.What problems are you experiencing?
After working with this camera with a couple different RTSP apps, I don’t understand how you say this camera is capable of 3264x2448 @ 15fps over MJPEG. The v4l2 driver does list that as an option, however if applied nothing can support it because the resolution is beyond the spec of JPG, which has a max pixel size of 2040x2040 as specified here:

7.What attempts at troubleshooting have you already made?

8.How would you like us to help you?
Explain how to get 3264x2448 @ 15FPS