Use existing AWS resources
To use existing Amazon Pinpoint resources with your Amplify backend or frontend application, use the addOutput method to surface backend resource outputs to the amplify_outputs.json file:
amplify/backend.ts
import { defineBackend } from "@aws-amplify/backend"
const backend = defineBackend({})
backend.addOutput({ analytics: { amazon_pinpoint: { aws_region: "<your-aws-region>", app_id: "<your-pinpoint-app-id>", }, },})