The FLOSS JTAG is based on an FTDI 2232HL chip that allows two simultaneous USB connections, which means that FLOSS JTAG allows JTAG and UART/COM connections.
The FT2232H Mini Module can also be used since this has the same chip.
On the bottom side there is 4 pin UART/COM connector, which contains (from top to bottom on the image, or color dots): Ground (black), RX (orange), TX (yellow), and +5V (red)