Docs: add parser example to extend built-in schema with JSON parse

[am29d]

What were you searching in the docs?

We have an example how to extend a built-in schema for EventBridgeSchema which is a trivial case where there is no transformation needed, because the input is an object.

In cases when we haven a stringified object inside the payload i.e. SQS or API Gateway, we need to use .transform() and .pipe() functions from zod. A missing example was identified in #2844 .

Is this related to an existing documentation section?

No response

How can we improve?

Add an example how to extend a built in schema for APIGatgewayProxyEvent which takes a string and uses transform() and pipe() functions.

Got a suggestion in mind?

No response

Acknowledgment

• I understand the final update might be different from my proposed suggestion, or refused.

[github-actions]

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