Gantt 1 task 2 bars in grid

I checked all examples in in samples folder (initialization, extensions, scale till worktime) but i could not find any example or something.

Is it possible that i have on right side:

Task1 (and this task should have two bars).
Why two bars ? Because that task has

  1. planned dateFrom and dateTo
  2. actual dateFrom dateTo

So i need 1 task to have two bars one under other.
Can anyone point me to some documentation or example ?

check this article
note, that this functionality is available only in PRO (commercial) versions of gantt