storage policy functions reference

Is there a more detailed storage policy functions reference than: https://supabase.com/docs/guides/storage

Is there a way to see the definitions of the storage helper functions from the database > Functions tab with a different schema?

1. The two helper functions that I need:
storage.filename(...) that returns only the filename without the extension: avatar instead of avatar.png

2. storage.folderpath(...) that returns the string path of the folders folder/again/here/ instead of an array of folders [ 'folder', 'again', 'here' ]

Thank you
Supabase Documentation
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