You can follow whatever terms you desire for your application as long as you fulfill the requirements of the licenses of all modules that you use. In case of MIT, it is attribution; in case of LGPL3, you need to make the source of the LGPL3 module available and you need to make it possible for the user to swap the compiled module you ship for their own version of that module.
Thanks for the heads up. I confess that I did not look deeply into library licenses while setting up the project. I will add a note about PySide2 being LGPL in the readme.