Meteor set overall template context

In meteor I can set various template helpers like this:

Template.story.title = function () {
  return "title";
};
<template name="story">
  <h3>{{title}}</h3>
  <p>{{description}}</p>
</template>

Which is great but, if I have a lot of variables I wouldn't want to set them individually, I want to pass the context to the main template.

How do I do that?

Template.story.data = function () {
  return {title:"title", description:"desc"};
};
<template name="story">
  <h3>{{title}}</h3>
  <p>{{description}}</p>
</template>

That doesn't work. THanks