No no, it is not a mod. You just need to move the folder of the app to "system" and it works (except grayscale) because is consider as system app.
Digital wellbeing of Google (for me) is much better than screen time, so I put this info here for those who wants to use it with xiaomi.eu
Thank you for the replay.
Could we use some workaround?
This is the reason why is impossible to set a specific time of use for apps?
Edit: Grayscale still didn't work but the rest works perfectly if you install it as system app using a root explorer and pasting the folder in/system/apps.
Digital wellbeing from Google doesn't work for me since I updated to xiaomi eu 12.
I can open the app but I cannot configure the time of use of each app.
Does anybody knows the reason?
Edit: It works if you install it as system app