Laravel whereIn array Invalid parameter number: parameter was not defined

Searching a trick for this issue How to use alias column in whereIn with Laravel?, I am trying:

$allowed_a = \App\NewA::select('name')->get()->pluck('name');        
$a = App\A::whereRaw("replace(unaccent(trim(name)), ' ', '') IN ?", $allowed_a)->get();

But I am getting Invalid parameter number: parameter was not defined, because I need so many

?

as many elements in the table, but the I do not know the array lenght. How to deal with this? Thanks

via Chebli Mohamed