Can we still bind instance var to template-local var?

[NanoWANG]

<dom-module id="x-element">
  <template foo="[[bar]]">
    <p>[[foo.nestedProperty]]</p>
  </template>
</dom-module>
<script>
Polymer({
   bar: { nestedProperty: 'whatever' }
})
</script>

Can we still do something like this currently?