Undefined variable in custom field

<?php

namespace App\Forms\Components;

use Filament\Forms\Components\Placeholder;

class Alert extends Placeholder
{
    protected string $view = 'forms.components.alert';
    public string $template = 'twui.info-alert';
    public mixed $content;

    public function type($type): static
    {
        $this->template = "twui.{$type}-alert";

        return $this;
    }
}

<x-dynamic-component :component="$template">
    {{ $getContent() }}
</x-dynamic-component>