i daresay that doc still isn't ready. Why wouldn't you demonstrate in that code example how to extract the info, float and int values from the trigger, or maybe how to identify the name of the animation?
Is this accessible via 1.92? When i use the code in the doc you linked, i get a "not found" error on 'tk2dSpriteAnimator'. When i use the "Check for Updates" menu option, i get the "unable to check for updates" error.