autocde2.0/app/Services/History/Converter/WhitelistConverter.php

<?php

namespace App\Services\History\Converter;

use App\Models\User;

class WhitelistConverter implements ConverterContact
{
    public function handle(mixed $value)
    {
        $ids = array_filter(explode(",", $value));

        if (! $ids) {
            return null;
        }

        $users = User::query()->whereIn("id", $ids)->pluck("name");

        return $users ? implode(",", $users->toArray()) : null;
    }
}