Tricky Validating

I send an input as an assiciatve array from a form like this:

[
    "43813c6a-857e-4ec4-b516-550ffc27183a" => "1"
    "f5c9ca97-c07d-48a0-b2c7-0b308a80c543" => "2"
    "7883c409-7cf0-4477-a068-e65373830445" => "3"
  ]

i have a validator like this:

$validated = $request->validate([
            'open_ids_texts' => ['required', 'array:'.$possible_option_ids->implode(','), 'size:'.count($possible_option_ids) , 
            'open_ids_texts.*' => [$question->required ? 'required' : 'nullable','string'],
        ],
            [
                'open_ids_texts.required'  => 'The :attribute is required.',
                "open_ids_texts.size"  => 'Each :attribute must be present.',
               
                'open_ids_texts.*.required'  => 'The :attribute is required.',
                'input_texts.*.string'  => 'The :attribute ha to be a string.',
            ]
        );

i want a costum error text for the keys not beeing in the list. (an equal to the list is also good)

i tried this, but didnt work:

 "open_ids_texts.array:".$possible_option_ids->implode(',')  =>'Each element in :attribute must be a valid option id',

how to achive that?