Adding products of a deal to automated e-mail

Hi all,

Whenever our sales team creates a deal in pipedrive they have to select the products/amounts they have sold. Once the deal is won we have an automated workflow in which there is a mail sent to our distribution center. Currently, the sales team has to write down the products they have sold in a customized field called "order" in the details section of the deal. This customized field is then taken into the automated e-mail.

I would like to skip this part and get the products chosen for the order in the emails automatically. However, I cannot select "Products" as an input field in the automated e-mails. Is there anyone that has an idea how to do this?