Position placeholder in validation messages

In Laravel 9 you can use the :position placeholder in validation messages if you're working with arrays.

This will output: "Please provide an amount for price #2"

class CreateProductRequest extends FormRequest
{
    public function rules(): array
    {
        return  [
            'title' => ['required', 'string'];
            'description' => ['nullable', 'sometimes', 'string'],
            'prices' => ['required', 'array'],
            'prices.*.amount' => ['required', 'numeric'],
            'prices.*.expired_at' => ['required', 'date'],
        ];
    }
 
    public function messages(): array
    {
        'prices.*.amount.required' => 'Please provide an amount for price #:position'
    }
}

Tip given by @mmartin_joo