Good afternoon CCooperAMC,
Thanks for reaching out to the QuickBooks Community! There is an open Bill by Job report in QuickBooks Desktop as well. I tested this, and the pay bills window has no option to add fields. You would have to have the report open behind the pay bills window to refer to. Seeing this, I will go ahead and send feedback to our Developers about adding a feature to allow this. Our team is always looking for ways to enhance the problem. You can review our QuickBooks Blog to stay up to date with the latest changes or adjustments.
If you have any questions, I will be more than delighted to assist you further. Don't be afraid to comment below! Until then, take care.