How to return federated type with @key(fields: "code") in Netflix DGS?

[aerospike2010]

Hi everyone,

I'm using Netflix DGS with Apollo Federation, and I need to return a federated type in the following format:

type Currency @key(fields: "code") {
    code: String!
}

type Product {
    id: ID!
    name: String!
    price: Float!
    currency: Currency!
}

How to return Product with a federated currency field when only storing its code:String in the database?

How can I properly define and return this type using Blaze Persistence?