Using Azure ADB2C Identity server.
How can I add a field for the "Company name" user attribute in a sign-up flow?
I see that Company name is a built-in attribute of a User in Azure ADB2C:

I already have created a working Sign up flow that is populating the First name, Last name and Job title attributes:

I would like to add Company name to the Sign-up form but I do not see the Company name as a "Built-in" user attribute available out of the box:

Should add a custom attribute? How to link it correctly to the built-in "Company name" user property?