Hi Pat
In your workbench, make sure to expose additional attributes for extended data.
The parameters dialog for the KML reader has a control "Additional Attributes to Expose" which brings up the dialog in my first screengrab.
Then in your workbech, expose and explode the list attribute - you'll get name and value attributes.
You'll have to do more work to pivot the exploded features back into a single part per kml_id.
Regards