WP-AppKit : Create a custom page on app side that has its own custom route and template

//In app's theme (functions.js)

/** 
  The following allows to create a custom screen on app side only 
  (meaning it does not correspond to an existing WordPress page or post).
  In this example, the page is accessed at the "url" #my-page-route and 
  uses the template 'my-page-template' to render. Last arguments allows to pass 
  custom data to the template.
*/
App.addCustomRoute( 'my-page-route', 'my-page-template', { some_data : 'for the template' } ); 

/**
  And if you want to pass dynamic data to the template, you can use the 
  'template_args' filter :
*/
App.filter( 'template-args', function( template_args, view_type, view_template ) { 
	if( view_template == 'my-page-template' ) {
		template_args.my_custom_arg = { my: custom_dynamic_value };
	}
	return template_args;
} );