Examples of CDK AmplifyDependentResourcesAttributes dynamic reference use

https://docs.amplify.aws/cli/custom/cdk/#reference-amplify-generated-resources
On this page you specify that you can use the `AmplifyDependentResourcesAttributes` to reference resources:
`Then use the cdk.Fn.ref function to create a dynamic reference of the dependencies' outputs.`

What would be good here is examples of how to use this dynamic reference.

Open the linked Amplify CLI custom CDK documentation page and find the section describing AmplifyDependentResourcesAttributes and cdk.Fn.ref. Add clear examples showing how to use the dynamic reference, then verify that the examples render correctly and match the surrounding guidance.

Written by the indexing model from the issue text.