What an odd thing to say! Have you not looked in the individual Apps Settings pages, or Androids's Settings > Sound?
I have unique notification tones on my Nokia 6.1 (Android 10) for each of:
2 different Gmail accounts (standard Mail app)
Calendar (standard Calendar app)
Incoming call (my chosen MP3 file)
SMS -Incoming Messages you can choose from about a dozen tones
Alarm sound
Biting the hand that feeds IT
