Mobile Keyboard overlay - explicit control over positioning possible?

Hi everyone, I'm working on a standalone native C++ Quest app that uses Android's built-in webview and other UI elements, for which I use the Oculus Overlay keyboard extension:

https://developer.oculus.com/documentation/native/android/mobile-keyboard-overlay/

I was wondering, is there a way to control where the keyboard is placed? I can't find any docs or anything about it, and 99% of the forum questions on this website assume you're using Unity instead of writing your own app / renderer (which is fair, but not helpful as Unity is closed-source so all the important implementation details are hidden from us).

Anyone have any tips? The keyboard often floats around in front of our UI and can't be placed where we want it to, in world. I'd like to have something akin to how the Oculus Browser works, with the keyboard fixed below the webview panel.