In case anyone is interested to add a Reply feature to chat, I’m happy to share an option:
It works like the first image… you can see that a couple of replies have been posted. Each reply includes the original message followed by the new reply.
I won’t describe in great detail, but in short, you enable an action called ‘Reply’ for the items in the Chat, which will Open a new screen for this item (in reality, when a user taps and holds a message, this will open an option to reply). You can mimic this by right mouse clicking in the layout view.
You then have a new slide-in screen as shown, which displays the original author, their original message followed by a text input box that rights to an additional column for ‘that items’ row, e.g. ReplyContent.
In the data editor you should add a template column as shown with the html script shown. You then replace the 3 values shown. This generates some neat formatting in the Chat window. Hitting select adds a new row to the Chat list and uses the template column as the message text.
It works really nicely and even adds the little vertical bar just like WhatsApp.