Currently, bold and italics are supported. Staff answering chats can send text styled this way regardless of the software client they are using to answer chats.
To send bold text, surround the text with asterisks, like this:
*this will be bold* will display as this will be bold
To send italics, surround the text with underscores, like this:
_show me the italics!_ will display as show me the italics!