Pods – Add function with image in $array

Hi,
I am using the add function to add records to pods.

I was able to add an image to a custom image field. I have a GUID in a PHP variable and I just assigned that variable as part of the array. My custom field of image type is called ‘evidencia’.

‘evidencia’ => $evidencia,

The question is if I wanted to save that image to the featured image instead of my custom field, what change do I need to do to my code?

Thanks.