UART from SCuM can passthrough nRF serial connection, but there are still minor problems that need to be fixed in the setup. For now, it’s easiest to use a USB UART device. One found here works well. Any serial device must be configured to it’s 1.8V setting to properly work with SCuM. You can use any serial monitor (set to 19200 baud), such as the one build into the Arduino IDE.