Can default alarms be accessed as audio files?
The default audio files that come with Android are encoded using the OGG Vorbis encoder and therefore you can find them in file-.system as .ogg files.
On Pixel phones the audio files are located in the path /product/media/audio/alarms/ respectively /system/product/media/audio/alarms/ (visible in this path in file manager apps like Cx File Explorer).
Use a file manager app or adb to access those files. the path is a bit different.