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var list = ['a', 'b', 'c'];
var root = {};
list.forEach((item) => {
  var current = {};
  current[item] = {};
  var keys = Object.keys(current);
  var t = findRoot(root);
  t[keys[0]] = current[keys[0]];
});

function findRoot(obj) {
  var keys = Object.keys(obj);
  if (keys.length == 0) return obj;
  var lastKey = keys[keys.length - 1];
  return obj[lastKey];
}

console.log(root);