release/scripts/startup/bl_ui/space_userpref.py

@@ -2329,6 +2329,9 @@ class USERPREF_PT_experimental_new_features(ExperimentalPanel, Panel):
                              ({"property": "use_override_templates"},
                               ("blender/blender/issues/73318",
                                  "Milestone 4")),
+                             ({"property": "use_new_volume_nodes"}, 
+                              ("blender/blender/issues/103248", 
+                                 "#103248")),
                           ),
                          )
 

source/blender/makesdna/DNA_userdef_types.h

@@ -653,7 +653,8 @@ typedef struct UserDef_Experimental {
   char enable_eevee_next;
   char use_sculpt_texture_paint;
   char enable_workbench_next;
-  char _pad[7];
+  char use_new_volume_nodes;
+  char _pad[6];
   /** `makesdna` does not allow empty structs. */
 } UserDef_Experimental;
 

source/blender/makesrna/intern/rna_userdef.c

@@ -6456,6 +6456,10 @@ static void rna_def_userdef_experimental(BlenderRNA *brna)
       "All Linked Data Direct",
       "Forces all linked data to be considered as directly linked. Workaround for current "
       "issues/limitations in BAT (Blender studio pipeline tool)");
+
+  prop = RNA_def_property(srna, "use_new_volume_nodes", PROP_BOOLEAN, PROP_NONE);
+  RNA_def_property_ui_text(
+      prop, "New Volume Nodes", "Enables visibility of the new Volume nodes in the UI");
 }
 
 static void rna_def_userdef_addon_collection(BlenderRNA *brna, PropertyRNA *cprop)