Is there a category/tag for when a character other than the protagonist is the one who is isekaied but the protagonist is from the world the series is set in? I have seen it in multiple series but my example below made it the entire plot so I want to tag it somehow

specific example Sute Akuyaku Reijou wa Kaibutsu ni Otogibanashi wo Kataru
Warning detailed spoilers for above manga

The protagonist is a normal noble girl in a world without magic. She is betrayed by her friend and sent to die (she is rescued). It comes out later that the friend is a reincarnator who decided that the protagonist was a villainess and needed to die. When asked directly why she targeted the Protagonist her answer was because your name is [Name of Protagonist]

If there isn't a tag already does anyone have a suggestion on how to word a new one that would have an obvious meaning? Everything I can think of might be mistakenly used by people who apply it to all non-isekaied Protagonists even if the story has no isekai elements at all.

*if I put this in the wrong forum please let me know

Probably use some variant of the Reincarnation tag. Maybe create something like Non-Protagonist Reincarnator but that might not be necessary. Similarly themed (a bunch of people apart from the protagonist are reincarnated in the world of the story) Boku igai Zennin Tenseisha ka yo!? uses Multiple Persons From Another World, Multiple Reincarnated Individuals, Reincarnated as the Villain/ess, Reincarnated in Another World and Reincarnation. As long as the tag Reincarnated Protagonist isn't used the tags technically don't specify that it is the protagonist that is the reincarnated person.

~4400 manga completed
~1700 ongoing...

After thinking about it for a week I ended up making a new tag. (I know the grammar isn't perfect for when the tag is referencing multiple characters but I wanted to keep it short while also being usable for more situations. If someone can think of a better way to phrase it let me know).

New tag -> 'Isekaied Character/s isn't the Protagonist'

@Armen Thanks for your suggestion. I ended up choosing to make a generic Isekai tag so it would be usable in more situations after finding a series where the non-protagonist isekaied character is summoned instead of reincarnated. (Which reminded me that there are multiple other series that have that happen)

The series that made me decide on making the new tag: Why Are You Obsessed With Your Fake Wife?

Protagonist is a native to the world the manhwa is set). Her husband in her first life is a person summoned from Korea, after she regresses to the past after being betrayed she gets married to a different man (another native)