Is there a way to invoke the keyboard overlay in a VR app not made with Unity or Unreal?

In the documentation, there seems to be a way to open the keyboard overlay for Unreal and Unity development:
https://developer.oculus.com/documentation/unreal/unreal-keyboard-overlays/

https://developer.oculus.com/documentation/unity/unity-keyboard-overlay/

However there is no indication on how to do the same with a third party engine or app written without using those two solutions, I couldn't find anything in the Mobile SDK docs: https://developer.oculus.com/documentation/native/android/mobile-intro/

Is this functionality available?

Thanks in advance for your help!