Q: How to do
A: See below
Although it's generally not necessary, there are various modules that pin-point and systemlessly mount only particular changes for particular purposes, what their developers took care about, it's generally possible to mount /system, /vendor, /product, /system_etc...
This is a guide for installing Magisk module ViPER4Android FX v2.7.2.1 (shortly V4A FX)
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Prepared and tested on Mi 11 Lite 5G NE (Lisa), with Xiaomi.eu Weekly 22.8.26 (MIUI 13/A12).
However, I made it first similarly to work on the same phone but with the stock MIUI 12.5.8 (A11)...