BookStack/dev/api/requests/content-permissions-update.json

{
  "owner_id": 1,
  "role_permissions": [
    {
      "role_id": 2,
      "view": true,
      "create": true,
      "update": true,
      "delete": false
    },
    {
      "role_id": 3,
      "view": false,
      "create": false,
      "update": false,
      "delete": false
    }
  ],
  "fallback_permissions": {
    "inheriting": false,
    "view": true,
    "create": true,
    "update": false,
    "delete": false
  }
}