Export including fields codec, bitrate & mode

Hi again. This question or something similar has been raised earlier, but I can't find any reply / solution that covers my specific need. The documentation doesn't give an answer either.
So, I wish to add the codec, bitrate and mode fields that are shown in the mp3tag window to the export field list. These aren't included by default. However, I can't find what names to use to extract these. Can you please list the field names that are supposed to go between the %% characters for these fields?

Fabulous!
Thanks a lot!