While you can certainly create links in readable text, you can't do that in input. What I did in Windward is have options to "link to chat" in Windward via right-clicking an item. Doing so automatically pasted the item's stats, color coded, into the chat box but I could have also created a clickable link instead. The key though, is not to put it into the input field, but to send it right away instead. That's what makes it trivial.
Otherwise it gets a lot more complicated.