Display counted number of leaves/branches on sunburst/treemap using textinfo, texttemplate, hoverinfo and hovertemplate

[archmoj]

Codepen

[etpinard]

I think the current behaviour makes sense when value isn't set.

[etpinard]

I'm not sure why anyone would want to show 1 in all the sectors

[archmoj]

I agree the ones (on leaves) may not be that useful; but the totals on branches are.
So, if you think the current behaviour is correct; we may possibly add another flag e.g. count?

[etpinard]

Adding count would be fine, yes.

[etpinard]

Will be part of #4185 - so adding this to the 1.50.0 milestone.

[archmoj]

So we should add a new key called count? Or using value key is fine?