Best way to continuosly cat tty to journal

I have a serial device that shows output at /dev/ttyX. I can cat this and watch the output come in on my current terminal, But I want to log the output to the system journal even if I'm not at a terminal. I could make a systemd service that is basically (pseudocode) tail -f /dev/ttyX | systemd-cat -t mydevice -p info. But is there a more built-in way to tell systemd to put the contents in the journal?