post a model : the parent in the json or not?

I am using laravel 8.

I want to store a model called "domain". A domain belongs to an organization.

I use this route :

Route::apiResource('organizations/{organization}/domains', DomainController::class)->whereUuid(['organization', 'domain']);

As the route is :

{{path}}/organizations/1a52ef80-9f9e-4172-9d8c-e63595ad3712/domains 

I have 2 choices to send the data to the server. I can post something like that :

{
    "organization_id": "1a52ef80-9f9e-4172-9d8c-e63595ad3712",
    "domain_name": "domain name"
}

or without the organization_id since it is in the path.

{
    "domain_name": "domain name"
}

What is a good pratice ? With or without the parent in the json ?