JJ1960 has it right. I make this kind of chart for most harem games I play, and if there's a notable non-LI character who it could be interesting to track the knowledge of, I add them to the bottom of the list, but without a column.
I have updated my older format, in fact, and it now looks like this (some abbreviations are different than expected because I change several names - NAT = Norah, DAH = Daphne, Oph = Erika):
View attachment 3610236
If anyone's curious about similar charts for other games, feel free to DM me to see if I have one, or DM on Discord if you are in a shared server with me, but let's keep that out of Trop's thread.
Edit: I just realized the status notes on the right give away some of my choices, heh. Well, so be it. It's not very surprising for anyone who's seen the kinds of games I like.