How to grant View only Access on the Elasticubes to Designers

I am trying to figure out is there a way to grant View only Access on the Elasticubes to Designers/Contributor Role so that they can view the Model while developing the reports without modifying the underlying model.
I tried to set via RestAPI but I am unable to achieve it. Appreciate any inputs here.
Here is my current setup:
PUT/POST : I tried with both
Role: Contributor

Path: manage/elasticubes
Manifest:

{
"add": false,
"modify":false,
"remove": false,
"modify_rights":false

}

Server Response:

{
  "error": {
    "subErrors": [
      {
        "moreInfo": {
          "invalidKeys": [
            "modify_rights",
            "remove",
            "modify",
            "add"
          ]
        },
        "code": 1064,
        "message": "the values for those keys cannot be overridden",
        "status": 422,
        "httpMessage": "Unprocessable Entity"
      }
    ],
    "code": 1060,
    "message": "manifest is invalid",
    "status": 422,
    "httpMessage": "Unprocessable Entity"
  }