diff --git a/python/core/auto_generated/layertree/qgslayertreemodellegendnode.sip.in b/python/core/auto_generated/layertree/qgslayertreemodellegendnode.sip.in
index e47a5411661..2d58bdd7f3e 100644
--- a/python/core/auto_generated/layertree/qgslayertreemodellegendnode.sip.in
+++ b/python/core/auto_generated/layertree/qgslayertreemodellegendnode.sip.in
@@ -94,6 +94,14 @@ Entry point called from QgsLegendRenderer to do the rendering.
 Default implementation calls drawSymbol() and drawSymbolText() methods.
 
 If ctx is ``None``, this is just first stage when preparing layout - without actual rendering.
+%End
+
+    void draw( const QgsLegendSettings &settings, QJsonObject &json );
+%Docstring
+Entry point called from QgsLegendRenderer to do the rendering in a \a
+json object.
+
+.. versionadded:: 3.8
 %End
 
     virtual QSizeF drawSymbol( const QgsLegendSettings &settings, ItemContext *ctx, double itemHeight ) const;
@@ -105,6 +113,17 @@ Draws symbol on the left side of the item
 :param itemHeight: Minimal height of the legend item - used for correct positioning when rendering
 
 :return: Real size of the symbol (may be bigger than "normal" symbol size from settings)
+%End
+
+    virtual void drawSymbol( const QgsLegendSettings &settings, QJsonObject &json ) const;
+%Docstring
+Adds a symbol in base64 string within the ``json`` object with the key
+"icon".
+
+:param settings: Legend layout configuration
+:param json: The json object to update
+
+.. versionadded:: 3.8
 %End
 
     virtual QSizeF drawSymbolText( const QgsLegendSettings &settings, ItemContext *ctx, QSizeF symbolSize ) const;
@@ -116,6 +135,16 @@ Draws label on the right side of the item
 :param symbolSize: Real size of the associated symbol - used for correct positioning when rendering
 
 :return: Size of the label (may span multiple lines)
+%End
+
+    void drawSymbolText( const QgsLegendSettings &settings, QJsonObject &json ) const;
+%Docstring
+Adds a label in the ``json`` object with the key "title".
+
+:param settings: Legend layout configuration
+:param json: The json object to update
+
+.. versionadded:: 3.8
 %End
 
   signals:
@@ -172,6 +201,9 @@ Constructor for QgsSymbolLegendNode.
     virtual QSizeF drawSymbol( const QgsLegendSettings &settings, ItemContext *ctx, double itemHeight ) const;
 
 
+    virtual void drawSymbol( const QgsLegendSettings &settings, QJsonObject &json ) const;
+
+
     virtual void setEmbeddedInParent( bool embedded );
 
 
@@ -358,6 +390,9 @@ Constructor for QgsImageLegendNode.
     virtual QSizeF drawSymbol( const QgsLegendSettings &settings, ItemContext *ctx, double itemHeight ) const;
 
 
+    virtual void drawSymbol( const QgsLegendSettings &settings, QJsonObject &json ) const;
+
+
 };
 
 class QgsRasterSymbolLegendNode : QgsLayerTreeModelLegendNode
@@ -389,6 +424,9 @@ Constructor for QgsRasterSymbolLegendNode.
     virtual QSizeF drawSymbol( const QgsLegendSettings &settings, ItemContext *ctx, double itemHeight ) const;
 
 
+    virtual void drawSymbol( const QgsLegendSettings &settings, QJsonObject &json ) const;
+
+
 };
 
 
@@ -419,6 +457,9 @@ Constructor for QgsWmsLegendNode.
     virtual QSizeF drawSymbol( const QgsLegendSettings &settings, ItemContext *ctx, double itemHeight ) const;
 
 
+    virtual void drawSymbol( const QgsLegendSettings &settings, QJsonObject &json ) const;
+
+
     virtual void invalidateMapBasedData();
 
 
diff --git a/python/core/auto_generated/qgslegendrenderer.sip.in b/python/core/auto_generated/qgslegendrenderer.sip.in
index 562fdcc6929..7f1297ddea5 100644
--- a/python/core/auto_generated/qgslegendrenderer.sip.in
+++ b/python/core/auto_generated/qgslegendrenderer.sip.in
@@ -76,6 +76,13 @@ The ``painter`` should be scaled beforehand so that units correspond to millimet
 Draws the legend using a given render ``context``. The legend will occupy the area reported in legendSize().
 
 .. versionadded:: 3.6
+%End
+
+    void drawLegend( QJsonObject &json );
+%Docstring
+Renders the legend in a ``json`` object.
+
+.. versionadded:: 3.8
 %End
 
     static void setNodeLegendStyle( QgsLayerTreeNode *node, QgsLegendStyle::Style style );