Both the Xiaomi Mi 8 and Mi 9T (also known as the Redmi K20) have received new custom ROM support that gives owners the chance to try out the Android 11 experience. The Mi 8 might have to camouflage itself as a Google Pixel 4a for this particular venture though.
https://www.notebookcheck.net/Xiaomi-Mi-8-gets-a-Google-Pixel-3-Android-11-port-and-the-Mi-9T-Redmi-K20-is-stable-thanks-to-the-AOSP-11-0-custom-ROM.494849.0.html