If you check the comments I asked the same question.

引用自 Savvy Kat：

Is it possible to make a tag for a specific person? Such as giving myself a special tag regardless of my usergroup?

引用自 Earu (author)：

@Savvy Kay, yes click on your name in the chat and do “Set Title”

So yes you can. You need to click a name in chat and you can set the tile that way.

thanks my dude