Multiple RESTDataSource response

I have 2 classes that extends RESTDataSource to consume differente API services. And I want to join the information of each other. Below I have index.ts:

(async (typeDefs: any, resolvers: any) => {
  const app = express()
  const httpServer = http.createServer(app)
  const server = new ApolloServer({
    csrfPrevention: true,
    cache: 'bounded',
    plugins: [ApolloServerPluginDrainHttpServer({ httpServer }),],
    dataSources: () => {
      return  {
        icpAPI: new IcpAPI(),
        agendamentoAPI: new AgendamentoAPI()

  await server.start()

  server.applyMiddleware({ app })
  await new Promise<void>((resolve) => httpServer.listen({ port: PORT }, resolve))

})(Schema, Resolvers)

Schema Index.ts

import { gql } from 'apollo-server-express'
import ItemPedidoEcommerce from './item-pedido-ecommerce'
import Parceiro from './parceiro'
import Agendamento from './agendamento'
import Pedido from './pedido'
import Vendedor from './vendedor'
import Status from './status'

const Schema = gql`







  extend type Parceiro {
    vendedor: Vendedor

  extend type Pedido {
    status: Status,
    parceiro: Parceiro

  extend type ItemPedidoEcommerce {
    pedido: Pedido,
    agendamento: Agendamento,
    parceiro: Parceiro,

  type Query {
    pedidoGARECommerce(id: String): ItemPedidoEcommerce
    pedidoGAR(id: Int): Pedido
    agendamento(id: Int): Agendamento
    codRev(id: Int): Parceiro

export default Schema

how could I do that?