For your first part it is definitely possible to show some kind of indication when needed user attention. For that yo can have a boolean column which is set as true/false based on some logic.
On Tab/Menu currently you can’t have any indication but on your Home Page or each Tab Page you can show a Button/Basic Table/Action Text… if the column is false and redirect user to a list of items needed attention. You can check in below post how the Cart is being highlighted (you need to sign-in in the app).
For second marking it as viewed, You can have a switch displayed to user to Mark as Visited. I am checking on how to automate “Mark as Viewed” as soon as navigated to that page.
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