The DRM is an attribute of specific products, not games. What we could do, however, is to list all DRMs available for the game in question.
So, for example,
The Witcher 3: Wild Hunt - DRM: Steam, Origin, GOG, Epic Games Launcher.
The filter on the Game page would work differently from the filter on the Deals page. It wouldn't be related to the minimum price at all. Using the DRM filter on the Deals page "reloads" all offers to find the specific store product that matches your search criteria. Using the DRM filter on the Games page would only affect the number of results, but wouldn't affect the prices displayed.
If you're fine with the mechanics I proposed, then, yes, your feature request is doable 😉
