What is the mapping of KeyCode.JoystickButton0 in the new Input System ?

Im trying to use KeyCode.JoystickButton0 of a Pico G2 headset (this is the enter button on the headset) to implement a gaze controller. I am trying to map the button to the input action but cannot find it on the input system. I practically want to invoke an XR controller trigger press to click on ui buttons. Any thoughts?

I’m having the same problem Mike, did you find any solution??

I’m having the same problem Mike&&spxyz, did you find any solution???

Pico stays its not possible in new input system:
https://sdk.picovr.com/docs/XRPlatformSDK/Unity/en/chapter_five.html#introduction-to-pico-g2-4k-input