Every page of a published Website automatically includes a small block of JSON LD, a structured data format search engines (and AI crawlers) read alongside your page's regular content to understand what your site and its content actually are. There's no toggle for this and nothing to configure, it's on by default for every published site.
What every page includes
Each page carries a WebSite object and an Organization object, both using your site's name (from Site Settings, or your project's own name if you haven't set one) and its real published address. If you've set a favicon from Site Settings, it's reused as the organization's logo, since it's already the closest thing to a logo your project has, there's no separate logo upload for this.
What a blog post adds
A blog post page includes everything above, plus a BlogPosting object with the post's title, its published and last updated dates, and its cover image if it has one. There's no per author byline concept in the Blog manager today, so the author is listed as your site itself, the same organization every other page already carries.
Checking it
View your published page's source (or run it through Google's Rich Results Test or the Schema Markup Validator) and look for a <script type="application/ld+json"> tag, that's it.
Tip: This covers general site and article markup only, it does not add anything like review ratings or FAQ style results, those need real data this project doesn't collect today.