JSFiddle - React, Tailwind, and code Playground

HTML

<span id="value">BILL.Municipal</span>

<p>Array: <span id="Array201603Concentration"></span></p>

<p>Array Sum: <span id="Array201603ConcentrationSum"></span></p>

JavaScript

const walk = (root, filter) => {
  const result = [];
  const follow = (root) => {
    if (root instanceof Array) {
      root.forEach(elem => {
        follow(elem);
      });
    } else if (root instanceof Object) {
      Object.keys(root).forEach(elem => {
        if (elem === filter) {
          result.push(root[elem]);
        } else {
          follow(root[elem]);
        }
      });
    }
  };
  follow(root);
  return result;
};

const tree = {
"BILL" : {
	"Municipal" : {
    "CAD" : {
      "Short" : {
        "Low" : {
          "High" : {
            "N" : {
              "CANADA" : {
                "IssueName00085" : {
                  "CA6832Z57Z70" : {
                    "201603" : {
                    	"Concentration" : 2,
                      "ConcentrationTier1" : 2,
                      "ConcentrationTier2" : 0,
                      "LargestTicket" : 0,
                      "Maturity" : 201708,
                      "Outstanding" : 140,
                      "SmallestTicket" : 0,
                      "Turnover" : 0,
                      "TurnoverTeir2" : 0,
                      "TurnoverTier1" : 0
                    },
                    "201604" : {
                      "Concentration" : 6,
                      "ConcentrationTier1" : 3,
                      "ConcentrationTier2" : 3,
                      "LargestTicket" : 0,
                      "Maturity" : 201708,
                      "Outstanding" : 140,
                      "SmallestTicket" : 0,
                      "Turnover" : 0,
                      "TurnoverTeir2" : 0,
                      "TurnoverTier1" : 0
                    }
                   }
                  }
                 },
                 "USA" : {
                 	 "IssueName00953" : {
                     "USA688I57Z70" : {
                        "201603" : {
                          "Concentration" : 4,
                          "ConcentrationTier1" : 2,
                         ...