Prevent fonts and sizes to change on deployment in Qt/Felgo

I recently distributed my app made with Felgo (and Qt) to Android using Microsoft App Store. Until now, I have been testing using a Felgo live client. However, though everything else works, one big thing I noticed is that all the fonts and font sizes where completely messed up. I believe this is because it is using Android native fonts instead of what I set in my code.

Is there any way I can fix this so that all my fonts are the same as what I tested with the live client?