class_docstr: Represents a message in a LLM chat conversation.
  
  :param content: The text content of the message.
  :param role: The role of the entity sending the message.
  :param name: The name of the function being called (only applicable for role FUNCTION).
  :param meta: Additional metadata associated with the message.
docstr: Create a message from the system.
  
  :param content: The text content of the message.
  :return: A new ChatMessage instance.
code: def from_system(cls, content: str) -> "ChatMessage":
      """
      Create a message from the system.
  
      :param content: The text content of the message.
      :return: A new ChatMessage instance.
      """
      return cls(content, ChatRole.SYSTEM, None)
  
file_path: haystack/haystack/dataclasses/chat_message.py
imports: from dataclasses import dataclass, field
  from enum import Enum
  from typing import Dict, Any, Optional
label_desc: Use image node_id 4 for calling the ChatMessage obj's underlying member method code with example usage: obj.from_system(cls, content) and returns: cls