Timeline drilldown on extra column

[AKG1_old1]

Hi,

I am using Timeline chart drilldown. when we click on timeline chart it should set value of Engine_ID , Reset_ID and source. but source is extra column and not being used in timeline chart so source value is not getting set.

Not sure if its possible to set token with source in this case.

<drilldown>
 <set token="engine_id_token">$row.Engine_ID$</set>
  <set token="reset_id_token">$row.Reset_ID$</set>
  <set token="source_token">$row.source$</set>
</drilldown>