Visualization Not Displaying in UI; Backend Returns js_chart as Dictionary

The Open Data QnA application successfully generates SQL queries and natural language responses. However, despite the backend (opendataqna Cloud Run service) returning the generated JavaScript chart data (js_chart), the visualization does not render on the frontend UI. No explicit error message is displayed on the UI itself related to the visualization failure, but the browser console shows a JavaScript error, and backend logs indicate that the js_chart is a dictionary.

Expected Behavior:

Upon receiving a valid SQL query and results, the backend's visualize function should return valid Google Charts JavaScript code (or a structured JSON for charting libraries like Vega-Lite/Altair) that the frontend can correctly interpret and render as a chart.

Actual Behavior:

The backend (opendataqna service) processes the visualization request and returns a JSON response containing js_chart data.
The js_chart content, as seen in backend logs and frontend network response, is a Python dictionary (representing the two charts, "chart_div" and "chart_div_1", with their respective JavaScript strings as values).
The frontend UI does not display any chart.
The browser's developer console shows a TypeError: Cannot convert undefined or null to object related to Object.entries in the main-PIBBDJBX.js (Angular compiled JavaScript).