For notch, there is a fix:
and seems that also Wifi is working now...
and is possible to enable notifications on left up corner
you can find a guide here:
I have no screenshots. LOS was my first step.
Download from Androidfilehost
For Notch and wifi you must flash more.
Look here in XDA.
Sorry. I told you an easy way to install LOS 15.1 on your Mi8.
For more Information read this.
Treble is quit new.
Short answer. Nearly the most mainstream treble Rom's work on Mi8. But not 100% exaktly. Mi8 notch for example.
So we need a Dev to integrate spezial Mi8 Things.
I hope I could help with the short way to install LOS 15.1.
Rest is yours.
Make a full Backup.
Test LOS. See whats work or not.
Search for missing, flashable Zip and integrate.
I found no Thread speziell for Mi8.
You can write a Guide what you did.