We have a customer requirements and they want have following requirements:
Any suggestion would be highly appreciated.
Yeah.. Such feature would be extremely useful.. I can see that Workflow Dashboard is under review on Nintex Uservoice: https://nintex.uservoice.com/forums/218291-3-nintex-workflow-for-office-365/suggestions/6635948-in-o...
I have no idea however what the result of the review is going to be as well as the shape of such functionality in O365.
I guess currently you need custom coding to deliver that sort of functionality.