Referring to https://platform.openai.com/docs/api-reference/chat/create, these messages can have names, but I don't find them in ChatCompletionRequestUserMessage or ChatCompletionRequestAssistantMessage or ChatCompletionRequestSystemMessage. This field is seldom used but it counts for tokens and (based on my experiments) is recognizable by GPTs.
Referring to https://platform.openai.com/docs/api-reference/chat/create, these messages can have names, but I don't find them in
ChatCompletionRequestUserMessageorChatCompletionRequestAssistantMessageorChatCompletionRequestSystemMessage. This field is seldom used but it counts for tokens and (based on my experiments) is recognizable by GPTs.