Hi @mushlih
I hope you are doing well.
You can use the CSS Class & ID option for this.
https://monosnap.com/file/bz74uLk99siAaRoPi0TcynQ3CWmnP0
Please navigate to the Smush > Lazy Load > Include/Exclude > Class & ID use: .wp-image-4148
This class seems to be the unique class for this image and will avoid excluding any other image.
https://monosnap.com/file/78wnUKLigyaXj7IGOascl5tgqBD4fb
However, in case you update the image, it will require updating the class too.
I suggest contacting the theme provider and suggest an ID for this image section that wouldn’t update if you replace the image.
Let us know if you need any further help on this.
Best Regards
Patrick Freitas