Problem with running a script to extract and convert a JSON object

Question

<script>
  $(document).ready(function() {
    var chains = ["arb", "astar", "aurora", "avax", "boba", "bsc", "btt", "celo", "cro", "eth", "ftm", "fuse", "heco", "hmy", "iotx", "kcc", "klay", "matic", "metis", "mobm", "movr", "okt", "op", "palm", "rsk", "sbch", "sdn", "sgb", "wan", "xdai"];
    var data = {};
    var getData = [];
    $.each(chains, function(index, value) {
      var chainName = value;
      var output = Object.keys(data.chainName.token_dict).map((k, v) => data.chainName.token_dict[k]);
      var getJSON = JSON.stringify(output);
      var json = '{"chain":"' + value + '","token_dict": [' + getJSON + ']}';
      getData.push(getJSON);
    });
    console.log(getData);
  });
</script>

There is a script that iterates through the array and extracts data from the JSON object, the problem is that for some reason the brute force script does not extract the value parameter (which refers to chains) and returns an error. What could be the matter?

the data variable contains data received by api: