Thanks Gerd, I have tested only a small bit but it looks promising.
It now routes via very sharp corners like this link:
https://graphhopper.com/maps/?point=52.194495%2C5.432616&point=52.191588%2C5.43437&point=52.192893%2C5.434665&vehicle=bike&locale=nl&elevation=true&layer=OpenStreetMap
With the regular mkgmap it makes a bigger detour.