protected function processNestedGroups($group)
    {
        $data = [];

        if (isset($group['fields']) && is_array($group['fields'])) {
            foreach ($group['fields'] as $fieldName => $field) {
                if (!empty($field['value'])) {
                    $data['fields'][$fieldName] = ['value' => $field['value']];
                }
            }
        }

        if (isset($group['groups']) && is_array($group['groups'])) {
            foreach ($group['groups'] as $groupName => $groupData) {
                $nestedGroup = $this->processNestedGroups($groupData);
                if (!empty($nestedGroup)) {
                    $data['groups'][$groupName] = $nestedGroup;
                }
            }
        }

        return $data;
    }