SwiftData query using two or more rows from the first table

Question

I have a Customer model and a Certificate model. Each Customer may have more than one Certificates How can I filter all Certificates from two or more selected Customers using a query in SwiftData. Note: Selected Customers are stored in a set

Here are the model definitions:

@Model
final class Customer {
  @Attribute(.unique) var vat: String
  var name: String
  @Relationship(deleteRule: .nullify, inverse: \Certificate.customer) var certifications = [Certificate]()
}

@Model
final class Certificate {
  @Attribute(.unique) var no: String
  var customer: Customer?
}

and bellow is the view for the certifications

struct CertificationList: View {
let customerNames: [String]?
@State var selectedCertifications: Set<Certification> = Set<Certification>()
@Query() private var certificates: [Certificate]
  
var body: some View {
  VStack {
    List(selection: $selectedCertifications) {
      ForEach(certificates) { certificate in
        NavigationLink(certificate.no, value: certificate)
      }
    }
  }
}

The query does no filter anything