Is it possible to specify a "name" for chat messages?

[talglobus]

OpenAI's ChatML includes an optional "name" field in addition to the role to indicate to the model who sent a given message:

Here's an OpenAI API example, adding a name to messages for few-shot prompting:

openai.ChatCompletion.create(
  model="gpt-3.5-turbo",
  messages=[
      {
          "role": "system",
          "content": "Translate from English to French"
      },
      {
          "role": "system",
          "name": "example_user",
          "content": "How are you?"
      },
      {
          "role": "system",
          "name": "example_assistant",
          "content": "Comment allez-vous?"
      },
      {
          "role": "user",
          "content": user_input
      }
  ]
)

And here's the generated input to the model itself on OpenAI's end:

<|im_start|>system
Translate from English to French
<|im_end|>
<|im_start|>system name=example_user
How are you?
<|im_end|>
<|im_start|>system name=example_assistant
Comment allez-vous?
<|im_end|>
<|im_start|>user
{{user input here}}<|im_end|>

Can this be done with Guidance? If not, is it on the roadmap? It's a super useful trick for getting the most out of their models.