While building kivy app for android using buildozer, I found an error saying pdfminer module was not found. Then I included the requirements of pdfplumber in the buildozer.spec file. Then I got the error that chardet was not found. Now should I keep finding and adding the requirements of the other modules as well? That is a very difficult process. Is there any easy solution for this? Please help. Any suggestions are welcomed.
Now should I keep finding and adding the requirements of the other modules as well?

Yes, you should.

Is there any easy solution for this?

You could make a virtualenv, install what you need letting pip resolve dependencies, then export the installed packages list and use that in buildozer.
Kivy app crashes saying no module name "chardet"