Delete an empty folder

Hello,
I would like to know if we can know the size of a directory, to detect if it is empty. My goal is to delete it.

Something like:

cleanup_dir_zz:
    filesystem:
      path: F:\zzJDL
      recursive: yes
      retrieve: dirs
     if:
       - size == 0: accept
    delete:
      allow_dir: yes
      clean_source: 2 

It could be “size” or “size_content”. Actually, there is “size_content” only for files.
thank you in advance !