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Add an %item_index variable to each item in a scene's menu, enabling unique images for each list item in a menu

Currently in scene menus (those are the lists), every item in the list reuses the same image. The only way to give each item a unique thumbnail image is if it's manually input. For variable input, it's impossible.
 
This variable would enable variable-populated menus to have unique images for each item.  For example, if your list contains a list of image files within a folder, you'd be able to display a thumbnail of each image in its entry in the list.  And if you were displaying a list of songs, you could show a thumbnail for each song.
 
Basically, when setting a menu's item template layout, I would like access to a variable that contains the index value of each item.  So if I go to the image within the template, I could set the image path to something like %thumbnail_paths(%index) and each item would get a different image.
 
I think this recording makes it clearer what I'm talking about: