Inventory Sheet should outline every print data

As i mentioned in the title,
it would be a huge help for us if the print data is outlined on an Inventory Sheet.

Imagine you have a print file that is plain white or is a white space with one or two logos on it and you want to see what it looks like after tFlow finished its work.

How can a customer (or someone who doesnt know much about tFlow or editing print data in general) reasonably understand what their file will look like if the boundary of the file is not distinctly marked on the inventory sheet?

Please see my screenshot to get the rough idea of what i mean.