Reference in multiple steps

It seems `grunt-include-replace` does not support deep reference.
The code below fails.
Does it have an update plan for this feature?

```html

• @@a


• @@b


• @@c

@@include('base.html', {
"a": @@a,
"b": @@b,
"c": "This is constant"})
```
```html

@@include('foo.html', {
"a": "This is constant",
"b": "This is constant"})
```

##### _P.S_
_Thanks for letting me enjoy replacing variables anyway :)_