How to validate array field value in laravel

I have created the form and created multiple fields.

<input name="members[]" type="text" class="form-control">
<input name="members[]" type="text" class="form-control">
<input name="members[]" type="text" class="form-control">

set the validation from the Form Request for the input fields

public function rules()
    {
        return [
            'password' => 'required|max:30',
            'members.*' => 'required|max:12',
        ];
    }

How can we check the members' field value exists in the database using the validation? For password using like this

'password' => ['required', function ($attribute, $value, $fail) {
                if (!\Hash::check($value, $this->user()->password)) {
                    $fail('Old Password did not match to our records.');
                }
            }],

via Chebli Mohamed