Correct way to not unmount a client component during soft navigation

[Luk-z]

Imagine a catchall route that fetch page structure based on pathname (aka ssr). The fetch and component render should be placed in page.tsx.
If two different pathname has same page composition (render same react components) is there a way to not unmount all (or some) page components during client navigation (sof navigation)?

I think this is not a pattern supported in next app route, but could be a common situation.