hmm, that sure is a feature i'd like to add to the module at some point!

For now, try this:

Go to the Tools > Developers Tool Kit and copy/paste some of the text from your customer email. This should give you the location of the file that contains this content.

Open that file and take a look at how the other information is relayed into the message. You should be able to copy/paste one of the fields and then use the variable from your new field.