Atlas App Services Schema one-to-many similar to RDB style

MongoDB Atlas App Services & Realm
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1

I have a couple collections with a one-to-many relationship like this:

Collection A(one):

{
_id: ObjectId,
collectionBId: ObjectId
...
}

Collection B(many):

{
 _id: ObjectId,
...
}

I want to be able to query this from the App Service graphql API like this:

collectionBs {
  _id
  collectionAs {
     _id
  }
}

Can I do this without building a custom resolver? Looking at the docs and the schema relationship options it looks like this is not possible right?