Hmmm. They don't make it easy, do they? The only way I can see is to attach a "photo" (when replying, look above the text box where it has the options for Bold, Italics, Underline, etc ... the "Photo" is about the 8th one).
If you do attach it be SURE to NOT show the client's Social Security Number.
If it is too problematic, you may just want to list the amounts in the response box (you can choose the "Numbered List", next to the "Photo" to correspond with the line numbers on the worksheet).