Before ollama and the others could do structured JSON output, I hacked together my own loop to correct the output. I used it that for dummy API endpoints to pretend to be online services but available locally, to pair with UI mockups. For my first test I made a recipe generator and then tried to see what it would take to "jailbreak" it. I also used uncensored models to allow it to generate all kinds of funny content.
I think the content you can get from the SLMs for fake data is a lot more engaging than say the ruby ffaker library.