Jekyll - exclude folder, but include subfolder

Question

I have a structure like:

folder/
folder/subfolder/

I want to exclude everything from folder/, except folder/subfolder/.

I there any way to do this with Jekyll? I tried a few combinations, but neither works, e.g.:

exclude: ["folder"]
include: ["folder/subfolder"]

Thank you for help!

Answer 1

As of Jekyll Version 4.X, it now possible to include subfolders and exclude base folder just as OP did in the posting.