Well-known member of the Nokia community Hikari Calyx posted a new guide on how to install Xiaomi’s MiUi 10 on selected Nokia devices. The guide is of course unofficial and you’re doing it on your own risk. It works for “fih_gsi_sdm660_64” Devices, that are Nokia 6.1, 6.1 Plus, 7 and 7 Plus. In theory it should also work for 7.1, but it hasn’t been tested yet on a 7.1.
If you have a spare Nokia phone for experimentation, you can check the MiUI 10 installation guide, that also offers details what works and what doesn’t and the requirements, at XDA forum here.