diff --git a/packages/core/src/promptdom.ts b/packages/core/src/promptdom.ts
index 5e77976f46..1f79f16df9 100644
--- a/packages/core/src/promptdom.ts
+++ b/packages/core/src/promptdom.ts
@@ -17,6 +17,7 @@ import {
 } from "./chat"
 import { errorMessage } from "./error"
 import { tidyData } from "./tidy"
+import { inspect } from "./logging"
 
 export interface PromptNode extends ContextExpansionOptions {
     type?:
@@ -391,7 +392,15 @@ async function resolvePromptNode(
             try {
                 const resolvedArgs: any[] = []
                 for (const arg of args) {
-                    const resolvedArg = await arg
+                    let resolvedArg = await arg
+                    // render objects
+                    if (
+                        typeof resolvedArg === "object" ||
+                        Array.isArray(resolvedArg)
+                    )
+                        resolvedArg = inspect(resolvedArg, {
+                            maxDepth: 3,
+                        })
                     resolvedArgs.push(resolvedArg ?? "")
                 }
                 const value = dedent(strings, ...resolvedArgs)
diff --git a/packages/sample/genaisrc/defdata.genai.js b/packages/sample/genaisrc/defdata.genai.js
index 98353ab15b..c5f4d9d4b1 100644
--- a/packages/sample/genaisrc/defdata.genai.js
+++ b/packages/sample/genaisrc/defdata.genai.js
@@ -1,6 +1,6 @@
 script({
     title: "defData demo",
-    model: "gpt-3.5-turbo",
+    model: "openai:gpt-3.5-turbo",
     tests: {},
     system: ["system"]
 })
@@ -17,5 +17,10 @@ defData(
     { format: "csv" }
 )
 
-$`Identify the data formats of A,B,C,D and return the format results as CSV with key value pairs variable,format.
+$`
+E:
+${[{ a: 7, b: 8 },
+    { a: 9, b: 10 },]}
+
+Identify the data formats of A,B,C,D,E and return the format results as CSV with key value pairs variable,format.
 `
\ No newline at end of file