Currently it is not possible to view your Custom Events in this manner. However, you should be able to send the STAGE_CLEAR event with a single parameter ‘3-2’ as a string. Then in the Data Explorer you will be able to view the pie chart and histogram graphs which will show you the counts of each STAGE_CLEAR event.
We are working on a raw data export feature but I cannot give you any concrete date of when this will become available but we will make an announcement once it is!