Image thumbnail on Excel export

Hi.
I’m trying to export an Excel file from a grid to includes image thumbnails.
Basically what I need is to export an Excel that includes an image thumbanail on one of its columns. If I include a Photo gallery field in my grid I can see the thumbnail on the grid but when I export the files the Photo Gallery column does not include the thumbnail.
Anybody ever had the same problem?

Thanks,

JM