Help set a virtual sensor value

I have a couple of Ikea Fyrtur blinds connected to Ikea GW, and the GW is connected to Homey. That way I can still use the remote that came with the blinds. In Homey I have made a virtual device that consist of both blinds. The “problem” is that if I use the Ikea remote to control the blinds, the virtual device/blind is out of sync. Can anyone show me how to make a calculation (guess better logic) so that the virtual blind is the average of the real blinds?
Have searched and read several posts, but still confused.

Have you tried the Homey app group?

Yes, use for several light groups. But didn’t find the “capabilities” in the app that i needed for the blinds :confused: