SERVO_OUTPUT_RAW not seen in charts

In my v1.9 FMU-v5 build, the SERVO_OUTPUT_RAW.* signals are not listed in the Widgets > Analyze charts. How do I enable them?

I’m in the process of bringing up a new flight controller based on the FMU-v5 design and I need to check what that the fmu is attempting to send signals to the motor controllers.