Using JUCE static library to achieve native Android UI

Hello everybody. I want to create an Android App that uses JUCE functions for audio stuff only while having native UI. The apporach that seems most reasonable to me is to use the Projucer option “static library” with Android exporter. To make the JUCE stuff accessible now, I have to write own extern C JNI functions to be called from another project using the static library later, right? And thats what I struggle with. I am not sure where to place those functions and what changes to make inside the Android project created by the Projucer. As a beginner, it all seems messy to me. Would be glad if someone can help out.