How can I access page meta data?

I can easily access normal title/description using {{ this.page.title }} but how would I get to meta data?

Thanks in advance, Martin

    <meta name="description" content="{{ this.page.meta_description}}">
    <meta name="keywords" content="{{ this.page.meta_keywords}}">

but this in my plugin, meta_descripton supports system pages? but keywords fields not exists

Thank you! It works perfectly.

and how do I get the main image?