Na tabelça BNCC:

r.db('MyTeacherTest')
  .table('bncc')//.count()
{
"createdAt": 20210319224003 ,
"descriptors": "D144 - Analisar as questões centrais do pensamento de Hannah Arendt." ,
"entity": 238290625366865 ,
"id": "000b8685-2fd3-42d1-ada4-4497c34d6668" ,
"object": "Filosofia Contemporânea" ,
"segment": "Ensino Médio" ,
"subject": "Filosofia" ,
"unity": "Eixo histórico" ,
"year": 2
}

Na tabela Content:

r.db('MyTeacherTest')
  .table('content')//.count()
{
"bncc": [
{
"duration": "" ,
"resource": "PDF" ,
"skill": ""
}
] ,
"content": [ ... ] ,
"contentType": 1 ,
"createdAt": 20210316221239 ,
"duration": { ... } ,
"exercise": null ,
"file": null ,
"grade": [ ... ] ,
"id": "0005c4b4-59e9-428a-99f6-c1b0451ca752" ,
"image": null ,
"lesson": "843dc993-1338-4c0a-b45f-67b79cb267a7" ,
"name": "Social" ,
"order": 3 ,
"publishDate": 20210312210000 ,
"stages": [ ... ] ,
"type": 2 ,
"userCreated": "f27a931c-4b97-44ae-b83b-fab6d5844f5a" ,
"video": null ,
"view": null
}