Add pdf kwargs propagation

src/zfitwrapper/Models.py

@@ -90,6 +90,7 @@ class Model(BaseModel):
 
             model = self._models[node.value]
             pdf = model["pdf"]
+            kwargs = model.get("kwargs", {})
 
             parameter = {}  # type: Dict[str, zfit.Parameter]
 
@@ -126,7 +127,7 @@ class Model(BaseModel):
                     (tuple(limits) if isinstance(limits[0], float) else limits),
                 )
 
-            zfit_model = getattr(zfit.pdf, pdf)(obs=obs, **parameter)
+            zfit_model = getattr(zfit.pdf, pdf)(obs=obs, **parameter, **kwargs)
 
             return zfit_model