Multi-shot is rather user/assistant turns that simulate successful completion before ultimate user input.
Completion models pick up on this very quickly, to where they don’t even need an instruction. Here’s davinci (its intelligence being turned off in a month) and what it writes is in color:
Chat models now verge on “untrainable”, with attention just to answer the current question against a fine-tuned “chat format” of answering. But you can try.
Best is specification, like “four sentences of output”.