Hi Juiliana, I dont believe its currently possible to do this as there is no named variable that you can use for properties like there is for fields such as the ticket number or assignee. Properties are created by customers, and are not out-of-the-box, thus we dont have a means of providing those attributes. This would definitely make a good enhancement to have a single variable that would show all properties associated with that ticket, which could then be used in the notification template. You can post this as an "idea" on the communities, which folks can vote for, and then product management will review and decide if its a viable feature for future releases of the product.
Hope this helps,
Thanks,
Jon I.