serverless.yml

custom:
  appSync:
    dataSources:
      - type: AWS_LAMBDA
        name: ProfilePictures
        description: Lambda function for the ProfilePictures
        config:
          lambdaFunctionArn: { Fn::GetAtt: [ ProfilePictureResolverLambdaFunction, Arn ]}
          iamRoleStatements:
            - Effect: Allow
              Action:
                - "lambda:invokeFunction"
              Resource:
                - { Fn::GetAtt: [ ProfilePictureResolverLambdaFunction, Arn ]}