What is the correct way to use express with a second div that needs data

I have the following layout.jade file:

!!! 5
html
    head
    body
        #left
            #leftbody
        #center
            #centerbody
                #container!= body
        #right
            #rightbody

And I have the following route.js file:

app.get('/',
    function(req, res) {
        Post.find({}).execFind(
            function(err, data) {
                res.render('post/index', {
                    posts: data
                });
        });
});

I'm currently rendering #centerbody based on links in the #leftbody. I'm wondering how I could use express to populate the #rightbody. Currently I'm populating a ul in #rightbody using an ajax call in document.ready but was wondering if there was another way using express.