Notification FR: display notification as a lightbox\modal

As a dashboard designer, I would like to be able to display a (center page) notification in such a way that access to the underlaying dashboard is no longer possible until the notification disappears.

At the moment, when displaying a notification, access to the dashboard (including all inputs) is still possible. This is not helpful because it allows the user to start a new process (form entry) while the previous entry is still being processed.