Creating dynamic lists in a form

Is there any way to have a template define a list to which I can add and remove rows?

E.g. if the model looks something like this:
```
{
 foo: [
    { bar: "baz" },
    { bar: "bazinga" }
  ]
}
```

I would need the ability to
1. Add and remove items from the `foo` list.
2. Define a template for the items in the list