Is it still not possible to add fields to an Expense Report line detail?

Looking at doc 2000212.1, it indicates that it is not possible to add another field to the expense report details form, but was last updated it appears a few years ago. Since it's been some time, is it still the case that we cannot add additional fields that end users can populate? This would be helpful for our management teams as they review their employee expenses rather than entering in the justification field.