Edit: Sorry, my answer will make edges longer, but not the self referencing edges you need.
len doesn’t work in dot, but minlen does.
https://www.graphviz.org/doc/info/attrs.html#d:minlen
x->y
[minlen=5]
Edit: Sorry, my answer will make edges longer, but not the self referencing edges you need.
len doesn’t work in dot, but minlen does.
https://www.graphviz.org/doc/info/attrs.html#d:minlen
x->y
[minlen=5]