feat: add metadata param

app.py

@@ -76,16 +76,19 @@ def convert(input_file):
     # Already a plain text file that wouldn't benefit from pandoc so return the content
     if any(input_file.endswith(ft) for ft in plain_text_filetypes):
         with open(input_file, "r") as f:
-            return f.read()
+            return f.read(), {}
 
     if input_file.endswith(".pdf"):
         return convert_pdf(input_file)
 
-    return convert_pandoc(input_file)
+    return convert_pandoc(input_file), {}
 
 
 gr.Interface(
     convert,
     inputs=gr.File(label="Upload File", type="filepath"),
-    outputs=gr.Text(label="Markdown"),
+    outputs=[
+        gr.Text(label="Markdown"),
+        gr.JSON(label="Metadata"),
+    ],
 ).launch()