Exporting Driven Dimensions into External Excel Design Table

Hi Team,

I am having trouble being able to get my driven dimension into my external design table file.

Steps taken:

-added new driven dimension to part file eg Length@Sketch1

-added driven dimension to design table named Length@Sketch1

-updated design table (no dimension was added beneath the )

-rebuilt the part file

I have read elsewhere that people have managed to extract the driven dimensions from a file into excel via a design table. Would anyone be able to guide me through this.

SolidworksParts And Features