Is it possible to create a sort of final pop up requesting confirmation before sending the form?

Is it possible to create a sort of final pop up requesting confirmation before sending the form?

A popup is not possible, but you can have a preview using our Preview Before Submit widget. 

https://widgets.jotform.com/widget/preview_before_submit

Please follow our steps in the guide below to add a widget in the form.

https://www.jotform.com/help/252-How-to-Add-a-Widget-to-your-Form

You should add the widget at the bottom part, before or after the submit button.