Is there a link attribute to indicate LLM chat content? Similar to rel="ugc"?

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Currently, there is no specific link attribute to indicate LLM chat content similar to rel="ugc". The rel="ugc" attribute is used to mark up links within user-generated content sections, such as comments and forum posts
However, there is no equivalent attribute specifically designed for LLM chat content.


What is the purpose of the rel="ugc" link attribute?
Are there any other link attributes that can be used to indicate chat content?
How can I use link attributes to improve the SEO of my chatbot?