So there used to be a plugin for this but it's not maintained anymore:
https://www.flickr.com/photos/t_trace/2060171212/
And there used to be a method to do this manually, but Apple deprecated it:
defaults write com.apple.finder QLEnableXRayFolders 1
Is there any way to QL inside a folder?
sindresorhus / quick-look-plugins
List of useful Quick Look plugins for developers
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