How to save a jpg (region, not a page)

When creating a jpg, I often want to save just a portion of a drawing, not the entire page.

For example, maybe I am creating a button and I want my jpg to be only 100 x 200 pixels.

Is it possible to save an image this way? FYI, I come from the Apple Works world, where this happens automatically. The jpg includes only the region that has content, and no more. Very useful.

In the Menu/File/Export, bottom-left is an option for selection.

This doesn’t work.

Then please open a bug report Libreoffice feedback