Use value-property and text-property as subpaths

[Zecat]

In <paper-autocomplete> it is not possible to use value-property and text-property as subpath.

Use case example

Some data

[{
    user: {
      firstname: 'John',
      lastname: 'Doe'
    },
    id: 1
 }, {...}]

You can't do

<paper-autocomplete
  text-property="user.firstname"
  value-property="id"
  ...
></paper-autocomplete>