django.core.exceptions.ImproperlyConfigured: 'django.db.backends.mysql' isn't an available database backend or couldn't be imported. Check the above exception. To use one of the built-in backends, use 'django.db.backends.XXX', where XXX is one of:
'oracle', 'postgresql', 'sqlite3'
Although pip install djongo installs django version 4.1.10, I found with some hunting that the latest version of django compatible is 3.0.5. Try installing that version of django
django.core.exceptions.ImproperlyConfigured: 'django.db.backends.mysql' isn't an available database backend or couldn't be imported. Check the above exception. To use one of the built-in backends, use 'django.db.backends.XXX', where XXX is one of: 'oracle', 'postgresql', 'sqlite3'