Alert - This question is basically about an approach. So there wont be any working pen or code to share!
I was doing a POC where integrating an RN app into an Android App. I did successfully following this doc. Here is the previews - 
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onclick of click to got to RN button,RN activity started and page B get loaded. Upto here all good. Now i am wondering where i can introduce a RN component into page A. for example the button on page A can be RN component ? or How can I open a specific component of my React Native application from an Native Android Activity in Java?
guess I have to check the ReactActivity in react-native repo to see how the a bundle gets rendered to the root view. The only thing that changes in my case is that I don't want to render to root view.
Here is files Link1 and Link2
This Q is asked in RN gitbub page - Link - and they redirected to SO.
So please share you suggestion or approach