Load "Added by" in the Source Info section for Job Applications using HSDL (HCM Spreadsheet Loader)

We want to load the Added By Field through a Spreadsheet, which is found in the Source Info section, which can be reached as follows:

1) My Client Groups / Hiring / Job Requisitions / Job Applications
2) Select the candidate
3) Details / Source Info

And within this section is Source Medium, Source and Added By; Of these fields, the only one that we do not see is the Added By. They can help
us understand why it is the only field that we cannot view from the Candidates Business Object.

Thanks