On the LG smartphone, a separate ringtone (notification tone) can be assigned to each individual app, and it is even possible to distinguish between individual notification groups and assign a tone to each of them.

Android 9 | LG UX 9.0
Step 1:  Open the  Settings
Step 2:  Tap on  General
Step 3:  Tap on  Apps & notifications
Step 4:  Tap on  App info
Step 5:  Tap on desired  App
Step 6:  Tap on  App notifications
Step 7:  Choose a  Category
Step 8:  Tap on  Sound
Step 9:  Tap on desired  Notification sound
Step 10:  Confirm with  OK
  1. Open the Settings
  2. Tap on General
  3. Tap on Apps & notifications
  4. Tap on App info
  5. Tap on desired App
  6. Tap on App notifications
  7. Choose a Category
  8. Tap on Sound
  9. Tap on desired Notification sound
  10. Confirm with OK

LG Instructions