Constructing nested array structs in BigQuery

with animal as
(
  select * from 
    unnest([struct
      (1 as zoo_id, 'Horse' AS animal_name, 1 as animal_count),
      (1, 'Cow', 25),
      (2, 'Old World Swallowtail Butterfly', 1000 ),
      (4, 'Fish' ,5500),
      (5, 'Beetle' ,700000)
    ]) 
)
, zoo as
(
  select * from 
    unnest([struct
      (1 as zoo_id, 'Skansen' as zoo_name, 100 as city_id),
      (2, 'Fjärilshuset', 100 ),
      (3, 'Zoologisk Have', 101  ),
      (4, 'Särkänniemi Aquarium', 102),
      (5, 'Kew Gardens', 103)
    ]) 
)
, city as
(
  select * from 
    unnest([struct
      (100 as city_id, 'Stockholm' as city_name),
      (101, 'København' ),
      (102, 'Tampere'),
      (103, 'London')
    ]) 
)
select
  c.*,
  array( select as struct 
    zoo_id,
    zoo_name,
    array( select as struct 
      animal_name, 
      animal_count 
      from animal a where a.zoo_id = z.zoo_id ) as animal
    from zoo z where z.city_id=c.city_id ) as zoo,
from city c



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