Hi, there is a Sounding feature on Windy which could be interesting for you. It allows to get a profile of the atmosphere above your location as provided by ECMWF. Click the right button of your mouse to open it.
It shows 2 curves: the red one is the air temperature, the blue one the dew point. When the 2 curves are close together, there is a risk of clouds at this altitude (the water vapor condensates when the air temperature reaches the dew point). The profile changes when you move the timeline cursor.
So it's another way to estimate the risk of cloudiness. But I don't know if it brings really additional information compared to the Cloud layer as it comes from the same model forecast.