Nested attributes for relationships

If I were updating / creating a "post" and I also wanted to create / update tag id 3 in the example below, should that be possible (i.e. similar to nested attributes in active record).

Probably a bit of a bad example, but hopefully you get the idea ?

I am finding that each entry in "data" in the relationships must only contain id and type. Nowhere have I yet seen how to do this in json_api in general, not just in this gem so maybe it is not possible. In which case, I guess I would need to create / update the tag seperately, but then I may need to worry about rolling it back if the creation / update of the post did not succeed etc...

post '/posts',
  {
    'posts' => {
      'attributes' => {
        'title' => 'A great new Post'
      },
      'relationships' => {
        'tags' => {
          'data' => [
              {type: 'tags', id: 3, attributes: {name: "New Tag Name"}},
              {type: 'tags', id: 4}
            ]
        }
      }
    }
  }

Aucun fichier source, test ou point d’entrée n’est indiqué. Commencez par examiner la gestion existante de la création et de la mise à jour des relations ainsi que les règles de JSON:API relatives aux données de relation, puis déterminez si les attributs imbriqués sont pris en charge. Le travail est terminé lorsqu’une décision claire est établie, avec le comportement des requêtes et les attentes concernant la transaction ou le rollback définis.