How to integrate an external app into IntelliJ plugin? Follow

I want to build an Android Studio plugin which can open an external app by pressing the button. The external app is developed by myself and is quite small. I hope to integrate it to the IntelliJ plugin so users only need to install the plugin instead of installing the app explicitly.

So is it possible for me to package the app into the plugin? I have tried putting the .app file under the resources folder but I don't know how to open the app programmatically. 

Or is it possible for me to get the external app installed when installing the plugin? I found kotlin plugin contains a folder called kotlinc which has many other files apart from .jar files. How does it achieve this? 

Many thanks for your help!