How to add javafx classes in an android project with Android Native classes in Android Studio?(Android Native Feature/views + some javafx class/views)

Question

Hey guys I have read almost all of the questions & answers on how to use jfxmobile, or Gluon to wrap a javafx project with gradle and to run them also on an android device. Also I know that one could use Intellij IDEA for instance have a project that is based on javafx and also handle some android classes/methods using FXActivity.getInstance(). But I have an android app in android studio with many android native code, and now I want to add some other code that relates to my application but is in javafx and I want to add them as a separate feature on my android application (not a sepparate app per say); just add them in addition to other features that were developed before using android native code in android studio. The question that I have is that how could I join those javafx apps to as a different feature in my application? I have seen Kokos sample for javafxports, but there are some issues with the Android Manifest File for now and I can't run it also it is a project of almost 5 years ago and I am not sure if the same procedures apply today with many updates. I just want to know how hard it is to do as I wish (and mentioned above)? and is it doable or there might be many issues on the way and I am better off to code for about three months of worth development with android libraries? *Time is really important in this project.