Merging "add" form in Django Admin from 2 or more Models (connected with one-to-one relationship)

I have a Django's default UserCreationForm to add a new user via Admin app. I want to add new fields from another custom model called UserProfile. The UserProfile has a One-to-One relationship with Django's User model. The additional fields which UserProfile model has are phone number, company name etc.

Is there a way where I can merge UserProfile form with Django's default User form while creation of the new user from Admin panel?

I looked at Django's documentation here on Inline forms but seems their require foreign key relationship.

Django 2.1

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