Is layered / hierarchy possible in d3-graph?

[SciTechDude]

Hi Team,

Is it possible to enforce layer/hierarchy on the graph to be rendered. As an example,
I've node as below
Nodes = [ n1, n11, n21, n111, n112, n121,122]]
Edges = n1 -> [n11, n21 ] , n11 -> [n111, n112], n21 -> [n121,122] with layers as below.
Layer-1 [ n1]
Layer-2 [ n11, n21 ]
Layer-3 [ n111, n112][n121,122]
.... and so on.

While I am able to get force directed graph using sample examples provided (see SO question for images), I don't see an option to provide layering or hierarchy like DAG onto graph.
What can be done in this case?

SO question: https://stackoverflow.com/questions/71667048/is-layered-hierarchy-possible-in-d3-graph

Result:

Desired: