An alternate way:
EPUB Split (the PI), but that will take some additional Metadata work
If you are OCD about documenting the contents of an Anthology, you also want Authors
My personal way is to set the {authors} to the
Editor_name (ed), or Various if it is not clear who it is.
THEN
I place a list of the
perps in a custom Authors-type column (I also use this column for the authors REAL NAME, when the book is written under a pen name

Adjust Preferences: Searching (near the bottom)
to make searches to look in both places