How to set time-period-type setting dynamically??

Dear Forum,

I have a XY-Line chart crated by Pentaho Report Designer.
And I used Time Series collector.

In this collector, there is "time-period-type" property and we can set "hour, minutes, millisecond,year, etc".
I would like to set this property dynamically.

If anyone knows about it, please let me know.

Thank you and regards,
Kyi