Can Meteor Templates access Session variables directly?

In my Meteor app I find myself writing a lot of things like:

Templates.myTemplate1.isCurrentUser = function() {
  return Session.get("isCurrentUser");
};


Templates.myTemplate2.isCurrentUser = function() {
  return Session.get("isCurrentUser");
};

I need many different templates (I'm using handlebars) to access the same simple value stored inside Session.

Is there a way to avoid writing the same function over and over again? Thanks