Camarray - external trigger mode

Hi there!

I was wondering if there is a way to external trigger the Arducam Camarray (2nd Gen) with four cameras?
I could not find any pin on the board to input a trigger signal.

Or perhaps would it be possible to put the Camarray Cameras into external trigger mode and trigger them individually? (Specifically the Arducam OV9281)

Cheers,
Tom