Updated custom ROMs based on Android 11 have become available for both the Poco F1 and Xiaomi Mi A2 smartphones. It has already been revealed that neither of these devices was on the list for official OEM support to Android 11, but custom ROM devs have not forgotten Poco F1 and Mi A2 owners.
https://www.notebookcheck.net/Poco-F1-and-Xiaomi-Mi-A2-owners-can-get-a-taste-of-Android-11-thanks-to-updated-custom-ROMs.494779.0.html