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What @pazos described is the *only* metadata-based approach you'll get.
The filemanager is, well, a filemanager, its source of truth is filesystem metadata, not document metadata (which, if any, is only parsed and shown as a *display* nicety). If you want to deal with that in a FM-friendly way, you'll have to play with your folder structure, which doesn't look like quite a good fit for what I think you're trying to do.
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