Hey there again! I've updated my 8.3 spreadsheet for Shadowlands this time. Here's some links for quickly sharing the doc in discords and stuff:
Image:
https://i.imgur.com/rpBCK5V.png
Spreadsheet: https://tiny.cc/ilvlscaling
As you can see there are some gray squares on the sheet that still need to be updated with the correct info. If you know more about those, or see something that's missing, then contact me.