jquery select by aria-label code example
Example: jquery get aria-label value
$(".togSubList").each(function () {
var bob = $(this).find(".parent_link").text();
$(this).find(".sub-expand_collapse[aria-expanded='false']").attr("aria-label","expand " + bob);
$(this).find(".sub-expand_collapse[aria-expanded='true']").attr("aria-label","close " + bob);
});