Backup System App

I have my phone rooted with magisk and am running a ROM based on Android Pie, which doesn't come with GApps, and therefore has builtin apps to do stuff, my interest is in the gallery app. I configured OpenGApps to not install Google Photos, and preserve the existing gallery app instead. I would like to take a backup of it so I can use it anywhere in the future, however the obvious way fails: ES File Explorer doesn't even see it, Lucky Patcher doesn't allow .apk backups of system apps, and I went into the directories manually only to find the lib folder outside the .apk. Am I safe to just copy the .apk and ignore the lib folder, or is there any other way I can try? Thank you for your time. Note: I would like the app saved as a single "normal" .apk file, instead of having the lib folder outside and having to carry that around, plus I wouldn't be able to place it if I didn't have root (for example, a new phone).