Showing the user a value by last submission

Unfortunately, we do not have a widget or tool to achieve that. However, you can create a Grid Report or HTML Listing report and you can embed it to your form using iFrame embed widget. 

https://www.jotform.com/help/326-How-to-Create-Form-Reports-in-JotForm

https://www.jotform.com/widgets/iframe-embed

Please try it and let us know if you need further help.