text-generation-webui/user_data/training/formats/llama2-chat-format.json

{
    "modelanswer,userprompt,systemprompt": "<s>[INST] <<SYS>>\n%systemprompt%\n<</SYS>>\n\n%userprompt%[/INST] %modelanswer%</s>",
    "modelanswer,userprompt": "<s>[INST] <<SYS>>\n\n<</SYS>>\n\n%userprompt%[/INST] %modelanswer%</s>"
}