Blazor page elements other than Body

I have a Blazor server-side app, trying to understand the structure. Inside the MainLayout.razor page, I see the tag @Body, and this is where each page's content is rendered.

I am wondering, is it possible to add additional render element to the mainLayout page? For example, a @Header section. And I would prefer to define this section inside each individual page as well.

In other words, for each page, besides the main content, it also needs to define Header, Footer, or whatever render element I define in the MainLayout. This way, I can have customize Header/Footer elements that are unique for each page.

Thanks for any help.