[Feature Request] Seperate sorting for series or not

i'd like to be able to use similar naming that i'd use in calibre.
{series:||/}{series:'first_non_empty(finish_formatting(field('series_index'),"0>2",""," "), finish_formatting(field('authors'),"","","/"))'}{title} - {authors}
If book is from series then 'series/index title - authors' otherwise 'authors/title - authors' 