Add extra key in laravel eloquent result

I have a laravel query builder result that looks like this

 "data": [
        {
            "id": "",
            "awardID": 2,
            "title": "Dummy title",
            "status": "active",
            "raceStart":"",
            "raceEnd:":""
        }
    ]
  

What i want to output is something like this

 "data": [
        {
            "id": "",
            "awardID": 2,
            "title": "Dummy title",
            "status": "active",
            "period": {
              "raceStart":"",
              "raceEnd:":""
            }
        }
    ]
  

This would have been much easier if the period was a table with a 1 to 1 relationship with parent table but this is not the case here. How can this be archived

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