I am using apex_data_export to build an Excel Export, which will be downloaded, changes made, and re-uploaded using apex_data_parser.
I cannot find a way to force apex_data_export to format columns as text so that leading zeros are not lost for values like 0004.

Is this possible with apex_data_export?
It looks like you can apply Oracle Format Strings to the output, but this does not help because the values are VARCHARs (e.g., 0004, 2338, 0006, ABCDEF).