I have no idea where you're going, but Kodi is an standalone application with its own addon 'store'.
Android .apk's have nothing to do with Kodi, or with LibreELEC for that matter.
Thanks!
I expected this, but it was only a question. I don't know, maybe it's available app in Kodi store which can install apk's from android inside. It's only question.
Thanks and sorry