I was tasked once with writing a front-end for an API that didn't exist yet, but I had a model. I could have written a loop that generated "Person Man 1", "Person Man 2", etc. with all of the associated fields, but instead I gave the LLM my class definition and it spat out 50 people with unique names, phone numbers, emails, and everything. It made it easy to test the paging and especially the filtering. It also took like 30 seconds to ask for and receive.
I originally asked it to make punny names based on celebrities, and it said "I can't do that." ☹️