Increase curvature of connecting arcs

Question

Consider:

digraph D {
    0[pos="0,0!"]
    1[pos="0,5!"]
    0 -> 1[label=0.25]
    1 -> 0[label=0.50]
}

Rendered under neato engine , this gives:

Is there a way to increase/control the curvature of the connecting arcs so that the rendering is something like the hand-drawn annotations below:

---

Edited to add: While I don't have to stick with neato , it is important in my application that the node pos coordinate values be upheld.

Answer 1

[there may be better ways, but edges are pretty hard to wrangle]
This solution requires neato -n (see https://graphviz.org/faq/#FaqDotWithNodeCoords ) and ( https://graphviz.org/docs/attrs/pos/ )

digraph D {
    // next 3 lines from the Graphviz FAQ
    overlap=false
    splines=true
    sep=.1

    // neato without -n option will just move the half node
    // neato -n uses different scale, so use scale attribute to use inches
    // neato -n ignores the !, it assumes all node pos values are final 
    scale=72

    0[pos="0,0!"]
    1[pos="0,5!"]
    // stick an invisible node in the middle, to force the edges out
    half [pos="0,2.5!" width=2.5  style=invis]  
    0 -> 1 [label=0.25]
    1 -> 0 [label=0.50]
}

Giving: