Nope: If you don't want it, then you have to not do it that way.
In a Template (for sending) you can use subitems(x,y)
https://manual.calibre-ebook.com/template_lang.html
FWIW Fantasy.High (why be redundant

Same goes for Fiction.Science Fiction ) I don't even bother with the Fiction base tag as most of my Library is. I only tag Non-Fiction