diff --git a/roofit/hs3/src/JSONFactories_RooFitCore.cxx b/roofit/hs3/src/JSONFactories_RooFitCore.cxx
index 90ffd950c7fe6..e3c9b2080479f 100644
--- a/roofit/hs3/src/JSONFactories_RooFitCore.cxx
+++ b/roofit/hs3/src/JSONFactories_RooFitCore.cxx
@@ -48,6 +48,7 @@
 #include <RooTFnBinding.h>
 #include <RooTruthModel.h>
 #include <RooGaussModel.h>
+#include <RooWrapperPdf.h>
 #include <RooWorkspace.h>
 #include <RooRealIntegral.h>
 #include <RooSpline.h>
@@ -1188,17 +1189,66 @@ class RooSplineStreamer : public RooFit::JSONIO::Exporter {
    }
 };
 
+class RooWrapperPdfImporter : public RooFit::JSONIO::Importer {
+public:
+  bool importArg(RooJSONFactoryWSTool *tool, const RooFit::Detail::JSONNode &node) const override
+  {
+    if (node["type"].val() != "density_function_dist")
+      return false;
+
+    auto name = RooJSONFactoryWSTool::name(node);
+    auto *func = tool->requestArg<RooAbsReal>(node, "function");
+
+    bool selfNormalized = false;
+    
+    if (auto sn = node.find("selfNormalized"))
+      selfNormalized = sn->val_bool();
+    
+    tool->wsEmplace<RooWrapperPdf>(name, *func, selfNormalized);
+    return true;
+  }
+};
+
+class RooWrapperPdfStreamer : public RooFit::JSONIO::Exporter {
+public:
+  std::string const &key() const override;
+
+  bool exportObject(RooJSONFactoryWSTool *, const RooAbsArg *arg,
+                    RooFit::Detail::JSONNode &node) const override
+  {
+    auto const *pdf = dynamic_cast<RooWrapperPdf const *>(arg);
+    if (!pdf)
+      return false;
+
+    node["type"] << "density_function_dist";
+
+    // Proxy name in RooWrapperPdf is "_func" / "func" depending on accessor/proxy export.
+    // Prefer a public accessor if one exists; otherwise inspect proxies as below.
+    auto const *funcProxy = dynamic_cast<RooRealProxy const *>(pdf->getProxy(0));
+    if (!funcProxy || !funcProxy->absArg())
+      return false;
+
+    node["function"] << funcProxy->absArg()->GetName();
+    if (pdf->selfNormalized())
+      node["selfnormalized"] << true;
+    
+    return true;
+  }
+};
+
 #define DEFINE_EXPORTER_KEY(class_name, name)    \
    std::string const &class_name::key() const    \
    {                                             \
       const static std::string keystring = name; \
       return keystring;                          \
    }
+  
 template <>
 DEFINE_EXPORTER_KEY(RooAddPdfStreamer<RooAddPdf>, "mixture_dist");
 template <>
 DEFINE_EXPORTER_KEY(RooAddPdfStreamer<RooAddModel>, "mixture_model");
 DEFINE_EXPORTER_KEY(RooBinSamplingPdfStreamer, "binsampling");
+DEFINE_EXPORTER_KEY(RooWrapperPdfStreamer, "density_function_dist");
 DEFINE_EXPORTER_KEY(RooBinWidthFunctionStreamer, "binwidth");
 DEFINE_EXPORTER_KEY(RooLegacyExpPolyStreamer, "legacy_exp_poly_dist");
 DEFINE_EXPORTER_KEY(RooExponentialStreamer, "exponential_dist");
@@ -1224,7 +1274,7 @@ DEFINE_EXPORTER_KEY(RooTFnBindingStreamer, "generic_function");
 DEFINE_EXPORTER_KEY(RooRealIntegralStreamer, "integral");
 DEFINE_EXPORTER_KEY(RooDerivativeStreamer, "derivative");
 DEFINE_EXPORTER_KEY(RooFFTConvPdfStreamer, "fft_conv_pdf");
-DEFINE_EXPORTER_KEY(RooExtendPdfStreamer, "extend_pdf");
+DEFINE_EXPORTER_KEY(RooExtendPdfStreamer, "rate_extended_dist");
 DEFINE_EXPORTER_KEY(ParamHistFuncStreamer, "step");
 DEFINE_EXPORTER_KEY(RooSplineStreamer, "spline");
 
@@ -1235,6 +1285,8 @@ DEFINE_EXPORTER_KEY(RooSplineStreamer, "spline");
 STATIC_EXECUTE([]() {
    using namespace RooFit::JSONIO;
 
+   registerImporter<RooWrapperPdfImporter>("density_function_dist");
+   registerImporter<RooExtendPdfFactory>("rate_extended_dist");  
    registerImporter<RooProductFactory>("product", false);
    registerImporter<RooProdPdfFactory>("product_dist", false);
    registerImporter<RooAdditionFactory>("sum", false);
@@ -1265,6 +1317,7 @@ STATIC_EXECUTE([]() {
    registerImporter<ParamHistFuncFactory>("step", false);
    registerImporter<RooSplineFactory>("spline", false);
 
+   registerExporter<RooWrapperPdfStreamer>(RooWrapperPdf::Class());   
    registerExporter<RooAddPdfStreamer<RooAddPdf>>(RooAddPdf::Class(), false);
    registerExporter<RooAddPdfStreamer<RooAddModel>>(RooAddModel::Class(), false);
    registerExporter<RooBinSamplingPdfStreamer>(RooBinSamplingPdf::Class(), false);