Get readout from AdGroupCriterionService selector

[Stella]

Hi,  I am using 201809 version of adwords. trying to first get and then 
modify bidding at adgroup level. 
My CAMPAIGN_ID=1647087544 is one with tcpa set 
with biddingStrategySource=CAMPAIGN level. I believe in that way I can see 
the bidsCPA value. however, the ‘bids’ field is returned as empty. I get 
returns like this

Your doc, does not tell me how to access to “bids” field, can you tell me 
specificlly how based on below code?
https://developers.google.com/adwords/api/docs/appendix/selectorfields#v201809 

Thank you

def main(client, campaign_id):

  # Initialize appropriate service.

  ad_group_service = client.GetService('AdGroupCriterionService', 
version='v201809')
  offset = 0
  # Construct selector and get all ad groups.
  selector = {
      'fields': [
          'AdGroupId','BaseCampaignId','QualityScore' 
          
,'BiddingStrategyId','BiddingStrategyName','BiddingStrategySource','BiddingStrategyType'
                 ],
      'predicates': [
          {
              'field': 'CampaignId',
              'operator': 'EQUALS',
              'values': [campaign_id]
          }
      ],
      'paging': {
          'startIndex': str(offset),
          'numberResults': str(PAGE_SIZE)
      }
  }

  more_pages = True
  while more_pages:
    page = ad_group_service.get(selector)

    # Display results.
    if 'entries' in page:
      for ad_group in page['entries']:
        print(ad_group)
    else:
      print ('No ad groups were found.')
    offset += PAGE_SIZE

    selector['paging']['startIndex'] = str(offset)
    more_pages = offset < int(page['totalNumEntries'])

if __name__ == '__main__':
  # Initialize client object.
  adwords_client = adwords.AdWordsClient.LoadFromStorage()
  main(adwords_client, CAMPAIGN_ID)


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