Pre-baked Messages

I see brief mention of “Structured Messages” in the features list of sendbird:

Structured messages

Allow developers to display offers in the chat interface and design custom messages for specific situations.

I can’t find any in-depth documentation around this. We want to offer a few, short, prebaked messages like “just arrived!”, “taking a break”, “heading out” to our interface. Think Uber’s in app chat. Is this what structured messages is? If so, where are the docs?