Header should be App Level rather than Page Level Only

[mehsaandev]

I observed that in Mobile application we doesn't always need to use the same header in much of the screens, we make header of each screen as required and the main header in for the main Home page.
But unlike this, in web we use same navbar in almost all the except a few (e.g Login/SignUp, etc)
and currently we have to make the header in each and every screen seperatly, the best shot we have so far is we make a seperate widget for Header in the global widget section and call that Header in each page header property. but this is still at some redundant, right?
So how about if we make a new property of header for ViewGroup (because currently I didn't find header property in ViewGroup). We have Drawer, EndDrawer, Sidebar but not the Header. so if we make header property in ViewGroup then in case of all the Pages linked with Sidebar of viewgroup will have that Header option too I guess.
Well this solution won't fully accomplish all the usecases like if we have some pages that are not linked with sidebar but still uses same Navbar will require Navbar to be seperatly called.
But the idea is that we should reduce the redundancy of this in Ensemble React