How to view Mileage on timesheet and summary exports

My employees get paid for mileage driven on their personal vehicles on a per-job basis. I enabled mileage tracking, and I can see the mileage on the dashboard, but when I export/download the CSV file, there is no column for mileage either on the individual time sheets or on the summary page.

Can someone explain to me how I can get mileage to appear in the timesheet downloads?