I needed the same thing - think I worked out how to do it.
1. Underneath the form where the 2 emails are click on both of the
Use HTML content type (it's a checkbox)
2. Style your emails however you want using Tags & CSS.
For example - Say you have [your-field] - style it like this
<span style="color: blue; font-weight:bold;">[your-field]</span>
You can also now put an image in your email - I will try now and test . . . . . it worked.
If you need any help feel free to ask - reply here or send me an email: info at worthdesigning dot com dot au
I know how frustrating it can be when you need to know how to do something and can't get help or work out how to do it.