Can default alarms be accessed as audio files? For a Pixel 2 with Android 11, are the default alarms stored locally as audio files? If yes, can the files be accessed through a file browser?
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.