Spark - Per Seat Target Types

Hey there, I'm currently working with a Laravel Spark instance that should allow users to customize subscriptions for different types of products.

To begin, I know I can call

Spark::chargeTeamsPerSeat('Projects', function ($user) {
    return $user->projects()->count();
});

Spark::teamPlan('Basic', 'team-basic')
    ->price(10)
    ->features([
        'First', 'Second', 'Third'
    ]);

in my app/Providers/SparkServiceProvider.php file.

As it stands, Spark seems to only allow (from what I can tell) mass assignment of one plan to each project instance.

A solution I'm looking for would allow a Team owner to customize plan types for each individual project; something similar to

Spark::chargeTeamsPerSeat('Projects', function ($user) {
    return $user->projects()->count();
});

Spark::teamPlan('Basic', 'team-project-basic')
    ->price(10)
    ->features([
        'First', 'Second', 'Third'
    ]);

Spark::teamPlan('Intermediate', 'team-project-intermediate')
    ->price(20)
    ->features([
        'First', 'Second', 'Third'
    ]);

Spark::teamPlan('Advanced', 'team-project-advanced')
    ->price(30)
    ->features([
        'First', 'Second', 'Third'
    ]);

allowing Teams to have a mix of "Basic", "Intermediate", and "Advanced" projects instances billed.

Any help would be greatly appreciated. Thanks!