The ‘Use as Featured’ is not a part of the fields, it is a part of the form itself. You have to make sure the theme supports post-thumbnails in order for WP to do its logic and conditionally display the item.
There is not an easy way to overwrite this functionality.
Here is the code to enable post thumbnails for the theme (presumably in your functions.php file)
add_theme_support('post-thumbnails');
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