Format isnt quite ready for you to use yet.
The first official release of Format will include all the functionality of JsFormat, plus HTML formatting (maybe more, we will see how it goes). Format dynamically decides which formatter to use based off of the file extension, falling back to the active syntax.
I won't push to this repo if the plugin is in an obviously broken state. Feel free to test it out. However, the keybinding will conflict with JsFormat.