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The "compressed (uncompress on load)" option will do this, the AUDIOGROUP files can only contain raw data so any OGG files (which is what the 'compressed' option will create) are placed directly in the game folder.
If WAV isn't an option, YellowAfterlife made an extension that puts all audio files in a separate folder and rewrites the project data accordingly.
(a third option is to have all your OGG audio be "included files" instead of sound files, so they end up in the datafiles folder, but then you lose out on being able to customize them in the IDE and have to manually load them as audio assets when the game starts)