Required Collection-link in Set inside Repeater

I am having hard time to make the Collection-link required inside a repeater and a set. Is there a way to make it required?
Here is my JSON:

{
  "fields": [
    {
      "name": "events",
      "type": "set",
      "label": "My events",
      "options": {
        "display": "limit",
        "fields": [
          {
            "name": "limit",
            "type": "text",
            "label": "The limit",
            "options": {
              "default": "0",
              "pattern": "^([0-9]+)$",
              "required": true
            }
          },
          {
            "name": "page",
            "type": "collectionlink",
            "label": "The linked page",
            "options": {
              "link": "page",
              "display": "title",
              "multiple": false,
              "limit": 1,
              "required": true
            }
          }
        ]
      }
    }
  ]
}

did you manage to get answer to this?