In Umbraco v12 I am trying to create a custom datatype. I have 2 config properties one called items and the other called defaultValue. In angular how can I access the data in items from defaultValue in order to populate a dropdown.

Here is my controller for the defaultValue config editor:

angular.module("umbraco").controller("RadioButtonListWithDefault.Controller", ['$scope', '$controller', function ($scope, $controller) {
      // Extend the core CheckboxListController
      angular.extend(this, $controller('Umbraco.PropertyEditors.CheckboxListController', { $scope: $scope }));

      const vm = this;
      vm.model = $scope.model;

      // Initialize items and default from the configuration
      vm.items = vm.model.config.items;
      vm.default = vm.model.config.default;

      // Watch for changes in the items configuration and react accordingly
      $scope.$watch('vm.model.config.items', function (newValue, oldValue) {
          if (newValue !== oldValue) {
              vm.items = newValue;
              updateDefaultItemOptions();
          }
      }, true);

      // Watch for changes in the default configuration
      $scope.$watch('vm.model.config.default', function (newValue, oldValue) {
          if (newValue !== oldValue) {
              vm.default = newValue;
          }
      }, true);

      // Function to update default item options based on the items property
      function updateDefaultItemOptions() {
          if (vm.items) {
              vm.defaultItemOptions = vm.items.map(item => ({
                  value: item.value,
                  label: item.value
              }));
          }
      }

      // Initialize default item options
      updateDefaultItemOptions();

      // Ensure model value is set to default if not already set
      if (!vm.model.value && vm.default) {
          vm.model.value = vm.default;
      }

      console.log("Model:", vm.model); 
      console.log("Items:", vm.items); 
      console.log("Default:", vm.default);
      console.log("Default Item Options:", vm.defaultItemOptions); // Debugging line
    }]);

$scope.model only gives me access to the current config item model and not the datatype config so that I can access the items.