How to use VBCS Excel Add-in to show/add negotiation line DFFs?

Summary:

Does VBCS Excel Addin support negotiation LINE DFFs?

Content (required):

The published API seems to exist

However, the business object doesn't seem to exist in VBCS catalog as a child of the lines?

Is this not available yet? Or is there another way of adding it?

Version (include the version you are using, if applicable):

22A

Code Snippet (add any code snippets that support your topic, if applicable):