Color control GX, read data kw/h from external source

Hi there.
Here is my query.
Introduction:
We have 6 MultiPlus-II 48/5000/70-48 single phase inverters (connected to form a balanced three phase system) controlled by a Color Control GX.
We are able to charge a battery through the AC IN line of the inverters, and we are trying that also through this AC IN line it is possible to supply energy to the grid, the problem is that to make the energy supply, we need to add to the Color Control GX an energy meter (the technical service tells us that it must be a Carlo Gavazzi equipment or a Victron NM 3P75CT equipment) compatible, which indicates to the Color Control GX the energy consumed by the grid.
Doubts:
Given that we already have measuring devices (not compatible with the Color Control GX) and that we have the possibility of writing these data in the Color Control GX both by Modbus and by MQTT, is there a Modbus variable or a MQTT topic in which we can write the energy data in the Color Control GX so that the energy supply works even if a compatible energy meter is not installed?