code: @SuppressWarnings("unchecked")
    public static List<LbConfig> unwrapLoadBalancingConfigList(List<Map<String, ?>> list) {
      ArrayList<LbConfig> result = new ArrayList<>();
      for (Map<String, ?> rawChildPolicy : list) {
        result.add(unwrapLoadBalancingConfig(rawChildPolicy));
      }
      return Collections.unmodifiableList(result);
    }
docs: Given a JSON list of LoadBalancingConfigs, and convert it into a list of LbConfig.