WowAce

I am using the "Grimoire: Imp Lord" ability, which allows me to dispel Magic effects. However, Grid2 does not recognize this ability within the "Dispellable by me" filter.
the addon doesn't see me as having a valid dispel, I am forced to enable "All Debuffs" to see the magic effects. This is very inefficient as I cannot create specific filters for every single magic debuff in the game; I need the "Dispellable by me" logic to work natively with this Warlock ability.
I am not sure if this is an easy fix, but it is quite annoying to have to manually check every single debuff icon just to identify which one is MAGIC, even if they are color-coded. The filter should handle this automatically to avoid confusion during the encounter. I hope this can be resolved soon.

Its not easy fix:  its simply impossible to fix.

Due to the new secrets system addons cannot customize anymore this kind of information, try reporting the issue to blizzard in game forums.

https://us.forums.blizzard.com/en/wow/c/support/bug-report/

As a ugly workaround you can create a new debuffs status (In Statuses>Debuffs) , configure the filter to display only typed debuffs (Magics,Curses,Poisons,Diseases and Bleeds) and set a transparent color for all debuffs types except "Magic", then link this status to any color compatible indicator, like a square, rectangle or border indicator. 

But it is not perfect, if different debufs types are enabled on a player, and the magic debuff is not the first in the list of debufs, this workaround does not work.

Thanks, awesome work btw :)