Parabola cannot insert image files directly into a table. The only way to do that is to insert a URL linking to where the image is hosted.
Try importing your table from Bubble into Parabola to see how those images are returned. You can reference their documentation to both authorize your request with an API key and send a request to a specific endpoint.
If you notice the images in your table are hosted image links, you can add new links to your Google Sheets to import them into Parabola and push them to Bubble.