On the LG smartphone, you can set an individual ringtone for each alarm clock and in addition to standard tones, you can also use your own alarm tones.

Android 9 | LG UX 9.0
Alarm Sound -  Open the  Clock -App
Alarm Sound -  Tap on desired  Alarm
Alarm Sound -  Tap on  Alarm sound
Alarm Sound -  Choose between  Alarm tone  and  Music
Alarm Sound -  Confirm with  Just once  or  Always
Alarm Sound -  Choose desired  Alarm tone
Alarm Sound -  Confirm with  Save
  1. Open the Clock-App
  2. Tap on desired Alarm
  3. Tap on Alarm sound
  4. Choose between Alarm tone and Music
  5. Confirm with Just once or Always
  6. Choose desired Alarm tone
  7. Confirm with Save

LG Instructions
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