see here to convert the field POPULARIMETER to a star-display:
See the help on supported fields like INITIALKEY and also on various rules how data in POPULARIMETER is interpreted:
The help also tells you how to get further columns.
Is that the "Key" field in Traktor, or the "Key Text" field in Traktor? They are 2 separate fields. Key Text is taken from the .mp3 file, but Key is Traktor proprietary, and lives in the Traktor Collection.nml.