How to setup dynamic directory for file poling from SFTP/FTP server location in SwitchYard ?

Issue

• It is required to poll files from SFTP server directory using SwitchYard FTP binding. The directory structure would look something like the following.

/Downloads
          --ABC
              --request
              --response
          --DEF
              --request
              --response
          --XYZ
              --request
              --response

• The requirement is to only consume file from request sub-folders (as shown above) and not from response sub-folders. i.e. the to enable polling files from remote FTP server only from a filtered list of directory/sub-directory where the filtering of directory/sub-directory name would be based on a user defined pattern.
• Is it possible to use wildcard directory structure something like /Downloads/*/request (where * means any folder like ABC,DEF,XYZ) in FTP binding to poll file? How can it be configured in switchyard.xml file to match the requirement?