Including the full referenced object instead of just foreign key in REST API

Developing for Dolibarr
1

I have an object below returned from my module via REST API.

  1. I would like to return the Product object referenced by the foreign key in the same payload so that I do not have to do two REST calls. How do I achieve this in Dolibarr?
  2. How do I remove all the other properties returned on my object, I have only declared 5 properties and I only want to retrieve these from my REST API. The other properties that I did not declare for example fk_project,contact_id, origin e.t.c, I do not want them to be returned from Dolibarr.
{
    "module": "grades",
    "label": "A",
    "description": "Grade A",
    "date_creation": 1651621735,
    "tms": 1651621735,
    "fk_product": 5,
    "import_key": null,
    "status": 1,
    "grade_order": 2,
    "id": 1,
    "entity": null,
    "validateFieldsErrors": [],
    "array_options": [],
    "array_languages": null,
    "linkedObjectsIds": null,
    "fk_project": null,
    "contact_id": null,
    "user": null,
    "origin": null,
    "origin_id": null,
    "ref": 1,
    "ref_ext": null,
    "region_id": null,
    "demand_reason_id": null,
    "transport_mode_id": null,
    "model_pdf": null,
    "last_main_doc": null,
    "fk_bank": null,
    "note_public": null,
    "note_private": null,
    "lines": null,
    "date_validation": null,
    "date_modification": null,
    "specimen": 0
  }