Node positioning question

[GreenRover]

Assuming this example:

Node a1 = node("A1");
        Node b1 = node("B1");
        Node c1 = node("C1");
        Node c2 = node("C2");
        List<LinkSource> linkSourcesB = new ArrayList<>();
        linkSourcesB.add(a1);
        linkSourcesB.add(b1);
        linkSourcesB.add(c1);
        linkSourcesB.add(c2);
        linkSourcesB.add(
                graph().graphAttr()
                        .with(Rank.inSubgraph(Rank.RankType.SAME), Rank.dir(TOP_TO_BOTTOM))
                        .with(a1, b1, c1)
        );
        linkSourcesB.add(
                graph().graphAttr()
                        .with(Rank.inSubgraph(Rank.RankType.SAME), Rank.dir(LEFT_TO_RIGHT))
                        .with(c1, c2)
        );
        linkSourcesB.add(a1.link(b1));
        linkSourcesB.add(b1.link(c1));
        linkSourcesB.add(c1.link(c2));


        Graph g = graph("broker2concentrator").directed()
                .graphAttr().with(Rank.dir(LEFT_TO_RIGHT))
                .nodeAttr().with(Font.name("arial"))
                .with(linkSourcesB);
        ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
        Graphviz
                .fromGraph(g)
                .render(Format.PNG)
                .toOutputStream(outputStream);
        return outputStream.toByteArray();

The current result:

The wanted result:

Is the wanted example possible and how?

Here a playground with full complexity: https://dreampuf.github.io/GraphvizOnline/#digraph%20G%20%7B%0A%20%20%20%20%0A%20%20rankdir%20%3D%20TD%3B%0A%0A%20%20A1%20-%3E%20B1%20-%3E%20C1%20-%3E%20C2%0A%20%20%0A%20%20subgraph%20%7B%20%0A%20%20%20%20%20rank%20%3D%20sink%20%3B%20rankdir%20%3D%20TB%20%3B%20A1%3B%20B1%3B%20C1%3B%20%0A%20%20%7D%20%0A%20%20%0A%20%20subgraph%20%7B%20%0A%20%20%20%20%20rank%20%3D%20same%20%3B%20rankdir%20%3D%20LR%20%3B%20C1%3B%20C2%3B%20%0A%20%20%7D%20%0A%0A%20%20%0A%20%20A1_x1%20-%3E%20A1%0A%20%20A1_x2%20-%3E%20A1%0A%20%20A1_x3%20-%3E%20A1%0A%20%20A1_x4%20-%3E%20A1%0A%20%20A1_x99%20-%3E%20A1%0A%0A%20%20B1_x1%20-%3E%20B1%0A%20%20B1_x2%20-%3E%20B1%0A%20%20B1_x3%20-%3E%20B1%0A%20%20B1_x4%20-%3E%20B1%0A%20%20B1_x99%20-%3E%20B1%0A%0A%20%20C1_x1%20-%3E%20C1%0A%20%20C1_x2%20-%3E%20C1%0A%20%20C1_x3%20-%3E%20C1%0A%20%20C1_x4%20-%3E%20C1%0A%20%20C1_x99%20-%3E%20C1%0A%20%20%0A%20%20C2_x1%20-%3E%20C2%0A%20%20C2_x2%20-%3E%20C2%0A%20%20C2_x3%20-%3E%20C2%0A%20%20C2_x4%20-%3E%20C2%0A%20%20C2_x99%20-%3E%20C2%0A%7D

[GreenRover]

here a possible solution. How is it possible to do this with the java api?

https://stackoverflow.com/questions/69080171/graphiz-direction-nodes-as-an-l/69081229?noredirect=1#comment122095835_69081229