ovl for sysftpd homebrew
Made it for my personal use
$ git clone --recursice https://github.com/SegFault42/sys-ftpd-ovl
$ cd sys-ftp-ovld
$ make
https://github.com/SegFault42/sys-ftpd-ovl/releases/download/1.0/sys-ftpd-ovl.ovl
Copy sys-ftpd-ovl.ovl to /switch/.ovl