CFS Custom query for Siteorigin Loop

Hi, I need to set a loop of content by using siteorigin LOOP widget.
So what i need deeply is a custom query that shows me only custom fields loaded in the specifica article.

I tried to set
POST QUERY = ALL
and POST IN = pages where i loaded documents (via custom fields ‘custom field suite’)

But it doesn’t work

I changed
POST QUERY = MEDIA

but no result so i image to use a custom query. But i don’t know how to do.

So can you pls helpme to create this custom query?
Pages where are loaded documents are id 317,334 and custom field is named ‘allegato’
…if this helps:
$fields = CFS()->get( ‘allegato’ );

thanks for your help