Not sure about Qt 5.10, but Qt 5.12 have support for arm64-v8a target. You will need to build two APK files, one for armeabi-v7a, and one for arm64-v8a, with different versionCode values in manifest, and then just publish both in the same release.
friend tell me what should I do, really apt get can put qt or you built from src, and direct me if I need this thing for developers, where to put the sources, I have arm64 linux @bruce_the_great