No you cannot use the OSM way IDs instead of GraphHoppers internal IDs. Currently even attaching them as meta-data is not implemented. Of course it is possible to do this, but it requires some modifications of the code. Use the forum’s search functionality. This question has been asked many times I think. The best approach might be creating an encoded value for the way IDs, then it should be easy to retrieve the OSM way IDs for a calculated route using the path details approach (if this is what you want to do). For example have a look here: Change speed for certain vehicle profile
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