RelayX definition visibility for given boards

Hi,

My board is:

JHEMCU-H743HD

The problem is I can only select a pin for RELAY1, while other RELAYs have not option to define theirs pins. I mean there is no RELAYx_PIN parameter when x is other then 1.
Is it a matter of board definition? I verified other boards do have named pin for RELAY2.

Here connectors S5 to S8 are free to use while only one of them can be assigned to any RELAYx and it has to be RELAY1

It was a matter of Mission Planner version. Once updated it can work with both Relay1 and Relay2