tinternet.net/config/packages/app.yaml

app:
    site:
        pages:
            App\Entity\Page\SimplePage:
                name: 'Page simple'
                templates:
                    - {name: "Template 1", file: "site/page/simple/page.html.twig"}
                    - {name: "Template 2", file: "site/page/simple/page2.html.twig"}