Wrap widget value in API format workflow (#2989)

src/utils/executionUtil.ts

@@ -66,9 +66,19 @@ export const graphToPrompt = async (
         for (const [i, widget] of widgets.entries()) {
           if (!widget.name || widget.options?.serialize === false) continue
 
-          inputs[widget.name] = widget.serializeValue
+          const widgetValue = widget.serializeValue
             ? await widget.serializeValue(node, i)
             : widget.value
+          // By default, Array values are reserved to represent node connections.
+          // We need to wrap the array as an object to avoid the misinterpretation
+          // of the array as a node connection.
+          // The backend automatically unwraps the object to an array during
+          // execution.
+          inputs[widget.name] = Array.isArray(widgetValue)
+            ? {
+                __value__: widgetValue
+              }
+            : widgetValue
         }
       }