Setting custom labels

const dataSource = {
  chart: {
    caption: "Asia Population - 2018",
    subcaption: "Highlighting highest and lowest populations",
    theme: "candy",
    formatnumberscale: "1",
    showlabels: "0",
    entitytooltext: "Population of $lName is $datavalue",
    showmarkerlabels: "1",
    connectorthickness: "1",
    entityfillhovercolor: "#E9F9F6"
  },
  colorrange: {
    gradient: "1",
    code: "#D5FFF6",
    minvalue: "0",
    maxvalue: "1500000000",
    color: [
      {
        minvalue: "0",
        maxvalue: "500000000",
        code: "#82D8C9",
        label: "Low"
      },
      {
        minvalue: "500000000",
        maxvalue: "1000000000",
        code: "#5DC080",
        label: "Medium"
      },
      {
        minvalue: "1000000000",
        maxvalue: "1500000000",
        code: "#29B6A3",
        label: "High"
      }
    ]
  },
  data: [
    {
      id: "010",
      value: "1415045928",
      showlabel: "1",
      displayvalue: "China : 1500M",
      fontcolor: "#000000",
      tooltext: "China has highest population of 1500M"
    },
    {
      id: "014",
      value: "1354051854"
    },
    {
      id: "015",
      value: "266794980"
    },
    {
      id: "033",
      value: "200813818"
    },
    {
      id: "005",
      value: "166368149"
    },
    {
      id: "019",
      value: "127185332"
    },
    {
      id: "034",
      value: "106512074"
    },
    {
      id: "047",
      value: "96491146",
      showlabel: "0"
    },
    {
      id: "016",
      value: "82011735"
    },
    {
      id: "052",
      value: "81916871"
    },
    {
      id: "042",
      value: "69183173"
    },
    {
      id: "008",
      value: "53855735"
    },
    {
      id: "023",
      value: "51164435"
    },
    {
      id: "054",
      value: "39339753"
    },
    {
      id: "001",
      value: "36373176"
    },
    {
      id: "055",
      value: "33554343"
    },
    {
      id: "046",
      value: "32364996"
    },
    {
      id: "028",
      value: "32042458"
    },
    {
      id: "031",
      value: "29624035"
    },
    {
      id: "056",
      value: "28915284"
    },
    {
      id: "022",
      value: "25610672"
    },
    {
      id: "049",
      value: "23694089"
    },
    {
      id: "039",
      value: "20950041"
    },
    {
      id: "053",
      value: "18284407"
    },
    {
      id: "021",
      value: "18403860"
    },
    {
      id: "009",
      value: "16245729"
    },
    {
      id: "003",
      value: "9923914"
    },
    {
      id: "062",
      value: "9903802"
    },
    {
      id: "058",
      value: "9541615"
    },
    {
      id: "041",
      value: "9107211"
    },
    {
      id: "063",
      value: "8452841"
    },
    {
      id: "050",
      value: "7428887"
    },
    {
      id: "026",
      value: "6961210"
    },
    {
      id: "064",
      value: "6093509"
    },
    {
      id: "025",
      value: "6132932"
    },
    {
      id: "044",
      value: "5851466"
    },
    {
      id: "038",
      value: "5791901"
    },
    {
      id: "057",
      value: "4829946"
    },
    {
      id: "061",
      value: "4197128"
    },
    {
      id: "013",
      value: "3907131"
    },
    {
      id: "030",
      value: "3121772"
    },
    {
      id: "002",
      value: "2934152"
    },
    {
      id: "059",
      value: "2694849"
    },
    {
      id: "060",
      value: "1566993"
    },
    {
      id: "006",
      value: "817054"
    },
    {
      id: "051",
      value: "632418"
    },
    {
      id: "007",
      value: "434076",
      fontcolor: "#00008B",
      tooltext: "Brunei has lowest population of 434K"
    },
    {
      id: "036",
      value: "\t143964709"
    }
  ],
  markers: {
    shapes: [
      {
        id: "myCustomShape",
        type: "circle",
        fillcolor: "#476b6b",
        fillhovercolor: "#FFFF00",
        showborder: "0"
      }
    ],
    items: [
      {
        shapeid: "myCustomShape",
        id: "BR",
        x: "519",
        y: "530",
        radius: "2",
        fontcolor: "#FF0000",
        tooltext: "Brunei has lowest population of 434K"
      },
      {
        shapeid: "myCustomShape",
        id: "BR-LABEL",
        x: "650",
        y: "470",
        label: "Brunei : 434K",
        labelpos: "RIGHT",
        radius: "0",
        tooltext: "Brunei has lowest population of 434K"
      }
    ],
    connectors: [
      {
        from: "BR",
        to: "BR-LABEL",
        tooltext: "Brunei has lowest population of 434K"
      }
    ]
  }
};

FusionCharts.ready(function() {
  var myChart = new FusionCharts({
    type: "maps/asia",
    renderAt: "chart-container",
    width: "100%",
    height: "100%",
    dataFormat: "json",
    dataSource
  }).render();
});

<div id="chart-container"></div>