Examples:

Using CloudFlare Workers.

Using Firebase Functions.

Use <img> in a platform view.

Flutter supports embedding HTML inside the app using
HtmlElementView.  Use it to create an <img>
element to render the image from another domain.
However, do keep in mind that this comes with the
limitations explained in the section
“Flutter renderers on the web” above.

As of today, using too many HTML elements
with the CanvasKit renderer may hurt performance.
If images interleave non-image content Flutter needs to
create extra WebGL contexts between the <img> elements.
If your application needs to display a lot of images
on the same screen all at once, consider using
the HTML renderer instead of CanvasKit.