digraph Trasaction {
bbb [ shape=record,
label="{ {Level 0} | { First | Second | Third } | { 0 | 1 | 2} }"
]}
Could the place that the arrow assign to be alignment?
You could just construct the label differently:
label="{ {Level 0} | { {First | 0} | {Second | 1} | {Third | 2} } }"
Perfect alignment!