How to make separate port?

My example:
As picture below. ‘D’ links to ‘J’ and ‘I’, ‘G’ links to ‘J’. The diagram will make user misunderstand that ‘G’ links to ‘I’

Note: I use “LayeredDigraphLayout” to draw diagram
Thanks for seeing

Try setting LayeredDigraphLayout.setsPortSpots to false and then on the Link template set
{ fromSpot: go.Spot.BottomSide, toSpot: go.Spot.TopSide }