OIC. My original suggestion was to add "Recently Imported" to existing menu items. But you want it added as a category item. It seems the best way to do that is with a Search List item. Remove the nested "Recently Imported" item you've added to "Movies" in the menu configuration.
If I understand your illustration, you have a "Movies" menu item where Keywords has been added to "Details." After Keywords, add a Search List item. Add to it a rule for "recently imported." Now a list with just one item in it is rather boring, so add anything else you might be interested in (e.g., recently released, highly rated, not yet viewed, etc.)—to create a Search List you can be proud of. Name the list "Filters." The list will behave in exactly the same way as any other category added to "Details."
Now, when you select a keyword, your list of filters will appear, including "Recently imported." The first item will be "All Filters," which allows you to bypass the list without using any of the filters. You can also start by selecting "All Keywords" if you want your filters to apply to all movies.