Only able to POST comment as Anonymous with JSON API

Dear devs,

JSON API allows to post and edit Drupal comments, which is great.

However, the relationship "uid" is only post-able if the permission "administer comments" is granted to the user role's. That may be an intended behaviour.

Nonetheless, when i post a node putting "uid" directly in the "data" of the request and not the relationships section, it works and drupal attach the node to the author automatically.

Now, when i post a comment putting "uid" in the data section of the request, it doesn't work and the uid relationships returns as anonymous after creation...

For exemple:

  "data": {   "uid": {
                                "data": {
                                    "type": "user--user",
                                    "id": this.node.uid.data.id
                                },
                            }
                        } 

In other words, the only way i found for the user to post comments as something else as anonymous, is to grant this permission to modify the comments of all users, which is far from the solution i want to opt in in a production website.

Is there some workaround to bind the comment to the posting user without granting a global permission to add and delete all comments ? Ultimately the behaviour is very different from a common drupal "node", which implicates additional front end works...

Thank you in advance for your enlightenment.