[FEATURE] Accept a JSON schema for structured output

[CrysisDeu]

Problem Statement

From https://amzn-custserv.slack.com/archives/C07FQ6RK37G/p1763419458529829?thread_ts=1763401815.694919&cid=C07FQ6RK37G

As a developer building AI Agent Authoring UI, I would like to have the capability to get structured output by passing a JSON in.

Proposed Solution

No response

Use Case

The JSON will be configured by my clients on a web UI with some JSON authoring tool.

Alternatives Solutions

No response

Additional Context

No response

[jrothman]

I'm also looking for a way to structure agent outputs according to a json schema