I did not arrange anything nor I know anything about it. Upon check in to the regular check in C desk, they told me that they have a new facility for priority and premium pax on the left corner of the terminal 2. 1 of the LH CGK staff guide me and then I proceed to the priority check in area.

It is quite like priority check in at Changi, you sit down while your baggages are escorted, carried and checked in by the staff - proceed to the priority immigration line inside the priority check in area where it is located directly behind the east side entrance of the premiere lounge.
Well done for Jakarta