You want to add a pop-up field to a progressive web form. Can this be done?
While you can't add a pop-up field to a progressive web form, you can specify the number of fields that display on a progressive web form for each visit. The web form will display those fields until they are completed and submitted. If you fill out one of the fields, on the next visit that field is replaced with a new one and so on.
Some of the options above would require them to create their own validation such as importing the form into landing pages.
Click here to learn how to set up a Progressive web form.