Getting data of selected node returned after d3.select

[manav-bhanot]

Describe the bug
I am trying to enable keyboard navigation (using arrow and w,a,s,d keys) on the d3-flame-graph. Initially I click one of the nodes in the flame graph and then in clickHandler, add a focussed CSS class to that node (represented by element in DOM) to display a boundary around it. Refer screeshot 1 below

Now on press of a key, I fetch the existing focussable node using d3-selection. eg select('.d3-flame-graph').select('svg').select('.focussed').node() but the .datum() property of the node does not give me the data for that node. Instead it returns the root node of the tree

Am I missing anything ? How can I get the corresponding node data ?

Screenshots

1. Focussed Node

Smartphone (please complete the following information):
N.A.

Additional context
N.A.