CakePHP 3.0 question - Creating association by assigning entity

gistfile1.md

Assuming Posts belongsTo Category is it possible to patchEntity of existing Post with this:

{
  "title": "foo",
  "category": {
    "id": 2,
    "title": "new title for category 2"
  }
}

to edit that post, create association between that specific post and Category with id 2 and possibly edit title of that category?