Cropping photos in Keynote

Is it possible to remove parts of photo outside of a mask?

Function "Reduce file size ..." only scales down image resolution, but parts outside of mask remain intact.

For example, size of presentation below is 4.7 Mb. You can see that most part of the photo is outside of mask but steel increase size of whole file, being unused.

On photo below you can see same presentation but with image cropped before being added in the presentation. The final size is 1.5 Mb. With 0.9 Mb base size of presentation without photos.

If there is no such feature please add it in further versions! Thank you!