The very best we could reasonably do is to import a subset of the initial objects and frames as Construct 2 objects and layouts. However it's very difficult, is easily broken if the file format changes, and is not all that useful (it is basically impossible to import everything since there are so many differences in how the programs work). We actually support importing layouts from GameMaker and GameSalad, and they were pretty complicated, and to be honest I don't know if they actually still work, and I get the impression very few people use it.
Besides, if you start from scratch in C2, you get the opportunity to make best use of its features (e.g. tilemaps, tiled backgrounds, sub-events, etc.)