Is there a way to calculate cover's position?

[fmalfatto]

Hello, I'm moving from Openhab to HA. Everything is easier and well running, but I miss only a small function on covers, a way to calculate position if they are not controlled by an advanced actuator.

I have several curtains managed by LN4672M2, and under Openhab I can define the object and it's time to complete the run: bus_automation Sogg_W "T. Sogg. Ovest" @ "Soggiorno" [ where="34", shutterRun="32000" ]

In this way I can send voice commands like "Open xxx at 50%". Is there some similar trick to obtain the same result in HA? Thanks in advance