How to convert the Mode::find(id) response in Laravel? - laravel

Question

I'm accessing a single model and loading its relation using this code below,
return Application::select('id')->with([
'oneApplicant:id,user_id,first_name,last_name,email',
'oneApplicant.referrer:id,parent_id,first_name,last_name,email',
'oneApplicant.referrer.parent:id,first_name,last_name,email',
])->find($id);
and the response is this
{
"id": 200,
"oneApplicant": [
{
"id": 200,
"userId": 9,
"firstName": "Mac",
"lastName": "Lebsack",
"email": "edicki#example.net",
"referrer": {
"id": 9,
"parentId": 5,
"firstName": "Aurelia",
"lastName": "Boyle",
"email": "uhirthe#example.org",
"parent": {
"id": 5,
"firstName": "Dewitt",
"lastName": "Bednar",
"email": "tluettgen#example.net"
}
}
}
]
}
I wanted to convert the response to something like this (couldn't care less about the other attribute, all I need is first_name, last_name & email )
[
{
"id": 200,
"userId": 9,
"firstName": "Mac",
"lastName": "Lebsack",
"email": "edicki#example.net",
},
{
"id": 9,
"parentId": 5,
"firstName": "Aurelia",
"lastName": "Boyle",
"email": "uhirthe#example.org"
},
{
"id": 5,
"firstName": "Dewitt",
"lastName": "Bednar",
"email": "tluettgen#example.net"
}
]
I was testing with map and transform but it doesn't even work and as I understand with the error, my result is not a collection.
Can someone guide me on how to achieve this,
Thanks