No, “ScrollingTable” can only scroll a whole GraphObject.
It really is easy to use two Diagrams, and then there would be real scrollbars that look and behave like all other scrollbars on the platform.
If you are using TableLayout, some Nodes can have GraphObject.rowSpan greater than 1.
But I see no reason why you need to use TableLayout – just create the nodes the height that you want.