Fronius Symo Modbus float model registers for dyn power reduction

my question isn’t about home-assistant implementation, but generally modbus oriented.
I’m searching for modbus register numbers for controlling dynamic power reduction mechanism.
In float model I found some registers.

I thing service modifications via browser aren’t implemented in modbus.
It’s possible to only set a % amount of max avalliable power with enable/disable modbus telegrams ?
Export limit protection set limit values haven’t equivalent as modbus telegramms or ?

This is a automation mechanism, that computed maximum inverter power dynamically according Fronius meter “feeding into grid” value. Above method needs to compute in external algorithm the necessary max power.
Thank’s for help.