Get center node value of the rendered sunburst chart Plotly.js 2.2.0

I am using plotly.js in my angular 10 app. Sunburst chart feature is working fine. I have a requirement where I need to take the center piece of the data rendered and use it to call a few webservices to populate other sections of the page.

Scenario 1 Works fine:
This works when I click from the initial root node and move towards the leaf (outer edges), because the outer edge value can be read using sun burst click event and eventually I know it is going to be the center piece.

Scenario 2 has problem
But when I try to click the center piece and move towards its parent (like reverse direction) , this center piece now becomes a leaf(becomes immediate outer edge) and its parent becomes the center piece, I wanted to know the center piece's value and use it to call other web services for my page. But I am unable to read the value of the center piece in this context.

I am curious to know how we can handle scenario 2. If there are properties/events to get hold of the center piece value after the chart is re-rendered, that will be great.

Plotly.js 2.2.0を使用するAngular 10アプリで逆方向ナビゲーションのシナリオを再現し、その後、sunburstのクリックイベントと再レンダリングイベントのデータを調査します。親に向かってクリックした後に中央ノードの値を取得でき、それによってページの他のセクションを制御できれば完了です。