View - group by certain property

We are creating a view of documents grouped by employees.

The issue is that on the documents we have multiple choose from list properties from object type Employees. For example:

- Employee

- Head of Department

- CEO

We want a view showing documents grouped by employee from property "Employee".

So if document "Document Example" has Employee = Joe and CEO = Phil, I want that document only to be shown for Joe.

Is that possible? When grouping, I can only select "Employee (any property)".