Creating custom-device interface gadget

Hi, I want to build a gadget with custom-device interface for libgpiod library.

This is the slot i added in the snapcraft.yaml of the gadget

> gpiod-interface:
>     interface: custom-device
>     custom-device: gpiod-device
>     devices: 
>       - /dev/gpiochip[0-1]
>     files:
>       write:
>         - /sys/devices/platform/soc/fe200000.gpio/gpiochip0/dev
>         - /sys/devices/platform/soc/fe200000.gpio/gpiochip1/dev
>         - /sys/devices/platform/soc/fe200000.gpio/gpiochip0/gpio/gpio11/direction
>         - /sys/devices/platform/soc/fe200000.gpio/gpiochip0/gpio/gpio11/value
>         - /sys/devices/platform/soc/fe200000.gpio/gpiochip0/gpio/gpio10/direction
>         - /sys/devices/platform/soc/fe200000.gpio/gpiochip0/gpio/gpio10/value
>     udev-tagging:
>       - kernel: gpiochip[0-9]
>         subsystem: gpio

I created a dangerous model and installed the gadget snap with this interface. But the interfaces doesnt show up when installed. Am i doing something wrong?