How to Integrate a Unity App into a Native Android Studio Project (Occupying 1/3 of the Screen)

I’m working on integrating a Unity application into a native Android Studio project. The Unity app needs to occupy about one-third of the screen while the rest of the screen is used by native Android components. Could someone guide me on how to achieve this setup? Specifically, I need to know how to embed the Unity view into a layout and handle its lifecycle within the Android project. Any help or examples would be greatly appreciated!

There are some limitations to using Unity as a Library. This is one of them:

From Unity 2019:

Only full-screen rendering is supported. It’s not possible to render only on a part of the screen.

From Unity 2022:

Only full-screen rendering is supported. However, if you are a Unity Industry customer, the limitations and features might differ.

Thank you for your help; I really appreciate it!
Could you guide me on how to open a fragment in full-screen mode when a button is clicked in a native Android app? If it’s possible, I’d be grateful for the instructions. Thanks!