Disable Rollup for Recent Data, but Enable Rollup for Historical Data

I need to know if this is possible in Druid 0.9.2 or later.
Disable Rollup for Recent Data, but Enable Rollup for Historical Data

As Druid 0.9.2 has new feature allowing us to disable rollup (rollup field in Granularity Spec), we can retrieve each ingested data without rolling up them.

I like to use this feature for recent data (i.e. for latest 7 days of data) for retrieving data as ingested without rolling them up.

However, I like to enable the rollup feature for historical data (i.e. older than 7 days old data) so that I can avoid extra runtime aggregation performance hit at the time when I ask aggregated data (count, etc.)

Thanks for your tips in advance.