Move the zipped ROM file into the MAME4droid/roms folder on your phone.
However, Tekken Tag remains an unofficial port for Android. This means that if you want to play it on your mobile phone, you will need to rely on third-party sources like APKPure or emulators. APKPure acts as a repository for APK files (Android Package Kits), some of which are modded versions, PSP rips, or emulated editions of the classic game.
Tekken Tag Tournament was never officially released by Bandai Namco as a standalone, native Android app. The mobile version you find on platforms like APKPure operates through one of two methods: