Mavlink to Ibus telemetry, fsi6

Hello, I installed a pixhawk 2.4.8 on a boat. I use fsi6 radio control telemetry, using arduino to do the conversion from Mavlink to Ibus.
The question is if there is any way to save 3 wp using an auxiliary channel and later select the desired wp from the radio control and send the boat to it in auto mode. The idea is that I don’t want to use a laptop or mobile phone to do this, I want everything to be done from fsi6.