Those who own the Mi TV 4A can now apply for a kind of Android Pie beta-test. Xiaomi is working on what it calls an 'early-access build' for this 32- or 43-inch device, and is currently inviting users to install and test it. The 4A's new OS adds support for the Play Store and Google Assistant (albeit in a slightly roundabout way).
https://www.notebookcheck.net/An-early-access-build-of-Android-Pie-for-the-Xiaomi-Mi-TV-4A-is-now-available.427224.0.html