Yes! You can use the triple-stache:
<p>Hello, {{{name}}}!</p>
In traditional Mustache, this means 'don't escape the value of name
'. Translated to Ractive, it means 'insert the contents as HTML rather than text.
Be aware that the HTML is not sanitised before insertion, so if name
came from user input there's potential for XSS and other nasties: http://jsfiddle.net/rich_harris/4jBC8/.