docs: def chain_present(name, table='filter', table_type=None, hook=None, priority=None, family='ipv4'):
      '''
      .. versionadded:: 2014.7.0
  
      Verify the chain is exist.
  
      name
          A user-defined chain name.
  
      table
          The table to own the chain.
  
      family
          Networking family, either ipv4 or ipv6
      '''
  
      ret = {'name': name,
             'changes': {},
             'result': None,
             'comment': ''}
  
      chain_check = __salt__['nftables.check_chain'](table, name, family=family)
      if chain_check['result'] is True:
          ret['result'] = True
          ret['comment'] = ('nftables {0} chain is already exist in {1} table for {2}'
                            .format(name, table, family))
          return ret
  
      res = __salt__['nftables.new_chain'](
              table,
              name,
              table_type=table_type,
              hook=hook,
              priority=priority,
              family=family
      )
  
      if res['result'] is True:
          ret['changes'] = {'locale': name}
          ret['result'] = True
          ret['comment'] = ('nftables {0} chain in {1} table create success for {2}'
                            .format(name, table, family))
          return ret
      else:
          ret['result'] = False
          ret['comment'] = 'Failed to create {0} chain in {1} table: {2} for {3}'.format(
              name,
              table,
              res['comment'].strip(),
              family
          )
          return ret