score:1

Accepted answer

you can put another circle or g element with circle and text into center and give it

yourZoomOutEleement
.attr('opacity',0)
.attr('pointer-events','none')

when sunburst is zoomed in, you can display your circle (or g with other elements in it) by specifying opacity

yourZoomOutEleement.attr('opacity',1)

see the block


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