Link distance between other link

It is possible to define the space between the lines so that in this case, the lines do not look like one line at the end of the links. I do not want to line up merged into one

Yes, as long as you are not using AvoidsNodes routing, which has its own routing algorithm.
If the routing is simply Orthogonal, you can just set or bind the Link.curviness.

Or you can be more ambitious and automatically calculate the values of Link.curviness as the CustomLink class does in the Dynamic Ports sample, where it overrides the Link.computeCurviness method in order to separate unrelated links. But note that in your case you are trying to separate related links, since it appears that the links connect to the same port at both ends.