Yeah, I saw that notice on the EMF plugin, and on the RuntimeAudioImporter github, ogg isn’t listed as supported. I also noticed that the editor doesn’t support ogg for import, either.
An alternative is to convert the ogg into a temporary wav file before importing it, then use RuntimeAudioImporter to import the wav file. You can either use a library directly in your project, or make an “ogg2wav.exe” program and run that from your game, then import the converted file.