As @idefix37 pointed out, there’s better metric for that and Windy already has the feature. It's the Snow depth forecast map, although it has it's limits - namely the grid of the forecast models (9 km for ECMWF, 7 km for ICON).

If you cumulate the snowfall over several days, it will not give exactly the depth of snow, because the snow compacts gradually: Its density increases.

On Windy the Snow depth layer gives you directly the information as well as the snow density.

But because of the low resolution of the weather models, this information is very rough and quite inaccurate in mountains.

https://www.windy.com/-Snow-depth-snowcover?snowcover,45.199,9.767,8,internal