Of course, you can use any templating option you like. Raw HTML was used in the examples because we don't want people getting confused by thinking that Composer makes this choice for you.
You can use Handlebars, Mustache, underscore, etc etc. Just take the output of your templating engine and pass it into `Controller.html()`.
You can use Handlebars, Mustache, underscore, etc etc. Just take the output of your templating engine and pass it into `Controller.html()`.