Beginning with Android 10 you can use WPA3 (system side).
With the new Vendor based on Android 10 (QKQ1.190910.002/V11.0.1.0) this has changed.
Now all is ready for WPA3 on Redmi Note 7.
But... Xiaomi has disabled it by default.
You can simple enable it.
You only need to edit the file...