According to a report, Xiaomi is planning to eventually bring Android 12 to over 70 devices, including those released under its Redmi, POCO and Black Shark brands. Older handsets like the Mi 9 and Redmi K20 series are supposedly set to miss out on Google's upcoming OS, though.
https://www.notebookcheck.net/Over-70-Xiaomi-Redmi-POCO-and-Black-Shark-devices-are-expected-to-receive-Android-12.557640.0.html