Let's go with open-source alternative.
Librera Reader is a highly customizable and feature-rich application
for reading e-books in PDF, EPUB, MOBI, DjVu, FB2, TXT, RTF, AZW, AZW3, HTML, CBZ, CBR, DOC, DOCX, etc. formats
https://play.google.com/store/apps/details?id=com.foobnix.pdf.reader
https://f-droid.org/packages/com.foobnix.pro.pdf.reader
Librera Reader is a highly customizable and feature-rich application
for reading e-books in PDF, EPUB, MOBI, DjVu, FB2, TXT, RTF, AZW, AZW3, HTML, CBZ, CBR, DOC, DOCX, etc. formats
https://play.google.com/store/apps/details?id=com.foobnix.pdf.reader
https://f-droid.org/packages/com.foobnix.pro.pdf.reader