How to write resolver for the parent & child schema if parent and childs microservice are in different db using python+strawberry

[bRameshShivakumar]

Dear Team
Good Morning
I am working for Python +strawberry with apollo federation.

Question:
My project has lot of microservice using nextjs i have integrated some services in graphql .
now want to integrate my new micro service with pydentic with mongo db .
i am having same scenario as
https://strawberry.rocks/docs/guides/federation

but the problem is that in the example
Books Service schema is used in review

# review/app.py

from typing import List
import strawberry

@strawberry.type
class Review:
    id: int
    body: str

def get_reviews(root: "Book") -> List[Review]:
    return [
        Review(id=id_, body=f"A review for {root.id}")
        for id_ in range(root.reviews_count)
    ]
@strawberry.federation.type(keys=["id"])
class Book:
    id: strawberry.ID
    reviews_count: int
    reviews: List[Review] = strawberry.field(resolver=get_reviews)


    @classmethod
    def resolve_reference(cls, id: strawberry.ID):
        # here we could fetch the book from the database
        # or even from an API
        return Book(id=id, reviews_count=3)

@strawberry.type
class Query:
    _hi: str = strawberry.field(resolver=lambda: "Hello World!")

schema = strawberry.federation.Schema(
    query=Query, types=[Book, Review], enable_federation_2=True
)

actually i need review schema not the book schema should be return in the reslover.
some thing like

class Query:
 get_reviews(bookid:id)->list[Review]
 get_review_id(id:):Review

when i call the book schema it should return books +review schema
when i call review it should return review schema based on bookid or all reviews

Please share me some samples