Mass Assignment of Json Columns via Wildcards

How can I allow mass assignment of a json field with wildcards instead of directly defining all the keys in the Fillable array?

I know that I can set nested json data if I use the fillable field, where 1, 2 = the order id. However, it's not practical to assign every single nested json dynamic value in the fillable array.

// This works for the exact nested values set. 
// Model
class Book {
	protected $fillable = [
		'related',
		'related->order'
		'related->order->1',
		'related->order->2',    
	]
}

// Some update file elsewhere

$orderID = 1;

$book->update([
	"related->order->$orderID" => $orderID
]);

However, wildcard values like

// Model
	protected $fillable = [
		'related',
		'related->order'
		'related->order->*'
	]

// Update file
$orderID = 5;

// Fails, nothing gets updated. The field, 'related->order->5` remains the same in the db json
$book->update([
	"related->order->$orderID" => $orderID
]);

Was this even possible besides using forceFill?

ie

// Model, nothing fillable set

// Update code
$orderID = 5;

// Works now
$book->forceFill([
	"related->order->$orderID" => $orderID
]);
$book->save();

I need this as setting a dynamic order $key->val update will override existingrelated->order values when I just want to append them.