Show number of active child nodes in the taxon page taxonomy tree view

For those of us doing curation tasks, when we are trying to determine what the alignment of existing iNat taxonomy is to an external source, it is very common in those external sources to give a count of the number of children something has.

But on our site, you have to manually count. For smaller taxa, not an issue, but for larger things it would make it so much easier to determine how close the alignment is.

So in here, (note the numbers I am adding are fake, I did not go count them).

The count should be only of items whose direct parent is the taxa indicated, not all children down though that chain.

would show something like
Salticinae (72)
—Aelurillini (7)
—Agoriini (24)
—Amycini (2)