We want to automate testing of ePUB3 reader in a mobile app

Requirements - We want to automate testing of ePUB3 reader in a mobile app. ePUB3 is a file type that is used for publishing the files to readers, similar to Amazon Kindle.
Automation testing Scenarios are – Audio and Text Annotation inside a document. Search/Bookmarks/Audio/Video / Push/Badges/ User Log/Annotation / Text Size of the document.
Issues Faced - We found that we were not able to spy the object properties for the ePUB3 document inside a native app via Appium.

Hi Mate,
Were you able to achieve this. I have been trying to do and no success on that.

Thanks!