Footnotes: can these be set in a book's Style Source?

[#1]

Hi all,

I'm trying to figure out how to set footnote styles that can be applied in a book's Style Source so that it inherits things like its Rule.

However, though I can save and apply paragraph and type styles, I haven't found a way to adjust footnotes across documents from the Style Source.

Is there a way to do this?
Also... I'm trying to figure out a way to have a bit more control over the appearance and typography, specifically, adjusting the space above the rule... can't quite figure this one out either. Probably just missing it...

Any help appreciated!

[#2]

Edit > Find/Change:

[#3]

There is a 2010 thread "Synchronising Footnote Options" over on InDesign Secrets with a Javascript that Jongware wrote and explains for copying the footnote options from one ID file to another. He updated the link in 2016 and it still works -- as does the script.