How to auto bind collection from HTML form using node.js express framework?

I am looking for a way to bind a collection on the server side, for example:

single binding

<input type="text" name="person[name]" />

binds to

person:{
    name: 'Name from html form'
}

If I am using express I can have access to this object at:

app.post('/person', function(req, res){
    console.log(JSON.stringify(req.body.person, null, 2));
});

collection binding

But now I am looking for a way to have multiple phone numbers, for example, I want this JSON to arrive:

person:{
    name: 'Name from html form',
    phones: [
        { number: '12345678' },
        { number: '87654321' }
    ]
}

So what is the syntax for binding an input to a collection field???

I tried <input type="text" name="person[phone][number]" /> with no success, and have no idea how to Google for it (I already tried, without success...). Is this a feature from express/connect? If not, what is the best way to achieve it? I know this feature is present on some Java frameworks, so this might exist here too.