I did manage to figure out a way to open urls in the parent window. by creating a single choice card and then leading to "send custom event" which sends a TRIGGER to send a url payload to a script on the website to open a link, which opens in the same window. that way after a user message, I ask the user if they want to read more, a yes leads to a send custom event, which sends the url to the script and it opens the window. not exactly what I was hoping to do, this doesn't change urls that are posted in the chat, but it does offer a method of being able to have the user click a button to open up a link in the same window.