I don't really know what you mean by checking. I'm pretty sure you can import from there but I haven't used that yet anyway because not a single food I've looked up there has had enough data for it to be usable for me and a lot haven't been added at all. Might be because I'm in Germany tho.

Edit: I've actually imported a product that did have all the information and it worked perfectly fine. You just share the link from OpenFoodFacts to Food You. Only monounsaturated and polyunsaturated fats didn't import but I've already opened and issue for that and it'll be fixed in version 3.