Thanks for reaching out to us for help. Unfortunately, the fill-in-the-blanks field is currently not included in the list of fields that can be added to the PDF builder. While the feature you’re looking for isn’t currently available, rest assured we’re always working to add new services and features to Jotform. I've gone ahead and escalated your request to our Developers. When or if it's implemented depends on their workload, how viable it is, and how many other users request it. If there are any updates, we’ll circle back to this thread and let you know.