Validation Rules WithHeadingRow and multiple possible names

[LvckyAPI]

Like in https://docs.laravel-excel.com/3.1/imports/model.html#possible-column-names I have a model definition with multible names.

The validation fails caused by 'fistname' not found. But 'Vorname' is same like 'firstname':

Code Example:

<?php

namespace App\Imports;

use App\Models\Campaign;
use App\Models\Contact;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Validation\Rule;
use Maatwebsite\Excel\Concerns\Importable;
use Maatwebsite\Excel\Concerns\SkipsEmptyRows;
use Maatwebsite\Excel\Concerns\ToModel;
use Maatwebsite\Excel\Concerns\WithHeadingRow;
use Maatwebsite\Excel\Concerns\WithValidation;

class ContactImport implements ToModel, WithHeadingRow, WithValidation, SkipsEmptyRows
{
    use Importable;

    public Campaign|bool $campaign = false;

    /**
     * @param array $row
     *
     * @return Contact|Model|null
     */
    public function model(array $row): Contact|Model|null
    {
        return new Contact([
            'firstname' => $row['firstname']
                ?? $row['vorname']
                    ?? $row['first_name'],

            ...
        ]);
    }

    public function withCampaign(Campaign $campaign): self
    {
        $this->campaign = $campaign;
        return $this;
    }

    public function rules(): array
    {
        return [
            'firstname' => 'required|string|max:255',
            ...
        ];
    }

    public function customValidationMessages(): array
    {
        return [
            'email.unique' => 'The email address is already in used in the campaign.',
        ];
    }
}

or same problem with

    public function rules(): array
    {
        return [
            '*.firstname' => 'required|string|max:255',
            '*.lastname' => 'required|string|max:255',
            '*.email' => [
                'required',
                'email',
                Rule::unique('contacts')->where(fn($query) => $query->where('campaign_uuid', $this->campaign->uuid)), 'required', 'email', 'max:255',
            ],
            '*.title' => 'required|string|max:50',
        ];
    }

Error:

{
	"message": "The 2.firstname field is required. (and 2 more errors)",
	"errors": [
		[
			"There was an error on row 2. The firstname field is required."
		],
		...
}

The Table (XLSX):

Vorname	Nachname	Email	salutation
Iven	S	[email protected]	Herr
Max	Mustermann	[email protected]	Herr Dr.

Question

Is there a way to validate all of the aliases at once?