Melinda M. Snodgrass (ed) & George R. R. Martin (ed)
Author sort ignores the () stuff
I also use (trans) for the translator
I use the editor(s) in {Authors}, and have a custom Authors type, field for (when) the contributing Authors
My old device only used file names on its bookshelf: {author_sort}-{title}
that kept the path name short(ish)
If you want a entry
PerEPUB Split the book
Add a tag: From <title of collection edited by...>