How to use the @salesforce/core.ConfigAggregator.create function in @salesforce/core

isGlobal: false,
          rootFolder: path.join(rootPath, '.sfdx'),
          filename: 'sfdx-config.json'
        });
        const localValue = myLocalConfig.get(key);
        if (!isNullOrUndefined(localValue)) {
          return localValue;
        }
      } catch (err) {
        telemetryService.sendException('get_config_value_local', err.message);
        return undefined;
      }
    }
    if (isUndefined(source) || source === ConfigSource.Global) {
      try {
        const aggregator = await ConfigAggregator.create();
        const globalValue = aggregator.getPropertyValue(key);
        if (!isNullOrUndefined(globalValue)) {
          return globalValue;
        }
      } catch (err) {
        telemetryService.sendException('get_config_value_global', err.message);
        return undefined;
      }
    }
    return undefined;
  }
}