How to USB CDCACM on Native zephyr samples or your own code.

[KurtE]

Wish there were more examples or in Zephyr world samples that can be easily built and run on
the Arduino boards.

For example: what does it take to build for Giga or Portenta H7 a native zephyr sketch that
I can output data serial data out over USB. (USB_NEXT)

I know there is a USB CDC example:
(.venv) D:\zephyrproject>west build zephyr/samples/subsys/usb/cdc_acm --pristine always --build-dir build -b arduino_portenta_h7@4.0.1/stm32h747xx/m7
That builds, but when I try to run it no USB device shows up for the portenta. Also there is an issue on it:

zephyrproject-rtos/zephyr#96844

But what I am wondering, is does one have to do things like, have the code to to generate a proper
USB Descriptor for the Arduino board, with the proper PID/VID, etc...

What else, that is not part of the Zephyr setup, does a sketch/app need to add, to run something like this.

Sorry, I know I am not being overly specific and I know that this is not also specific to USB. That is there appears
to be a lot of the modules/devices where the definitions for them are in the ArduinoCore-zephyr variants
versus in the zephyr/boards.

Thanks