Format the text in messages.
Basic WhatsApp text formatting option are available in flow editor. Refer this article for more details
Text Formatting
1 . User * to make the text bold. - Bold
2 . User _ to make the text italic. Italic
3 ** . ** User ~ to strikethrough the text .~strikethrough~
4 . Use ''' for monospace- '''monospace'''
Add Emojis
Generally, all browser provide Emojis extension. Once you have added the extension, you can add emojis with right click in the text editor of message.
Below example is from chrome.