Speed in RTL mode

How to configure desired speed in RTL mode?

Check out:
MPC_XY_CRUISE
https://docs.px4.io/v1.11/en/advanced_config/parameter_reference.html

Thank you.
But this is only for multicopter, isn’t it?
Am I right, that for fixed wing FW_AIRSPD_TRIM will be used?

I’ve only done multi-copter so I am not sure.
Try it???