Key of radio-button into json view

Question

Hi there,

I am using the view_datasource module with drupal5 to get a json view. Now I have a cck-field with radio-boxes and want the key to be displayed in the json. However, it always displays the label.

My allowed value list:

http://dummyimage.com/960x240&text=foo|<img src="http://dummyimage.com/96x24&text=foo">
http://dummyimage.com/960x240&text=bar|<img src="http://dummyimage.com/96x24&text=bar">

Any ideas how to get the key into my json?