on this thread I show how you can add a default message to the message history. you should be able to use an array of objects or use a loop instead to display a whole bunch of messages.
in a nut shell you use the Disable query property to prevent the ai from actually running, then clear the history, and finally you call chat1.sendMessage({...}) which adds the message to the chat history but doesn't attempt to send anything. at the very bottom of the page (the last post) I alsoinclude an app export w the whole process. if anybody needs me to, I can go back and edit it for more than 1 message and re-upload it here, just let me know