PWM_INPUT doesn't work on V6x

I want to use pwm_input on v6x. But after turning on the function and connecting the pwm signal, the pin does not enter the interrupt, resulting in the failure to update the msg message, and I found it in the v6x codebase, PX4-Autopilot/boards/px4/fmu-v6x
There is no pwm_input option under /default.px4board. There are other models, does it mean that this function is not supported on v6x?
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