docs: public AccountAggregationSource withAwsRegions(String... awsRegions) {
          if (this.awsRegions == null) {
              setAwsRegions(new com.amazonaws.internal.SdkInternalList<String>(awsRegions.length));
          }
          for (String ele : awsRegions) {
              this.awsRegions.add(ele);
          }
          return this;
      }