Hi there,
Is it possible to add the image sizes Woocommerce generates to the thumbnail size options please?

Currently the WordPress default sizes are the only available options
Full | Large | Medium | Thumbnail

Woocommerce generates these (though also currently supports the WordPress sizes):
woocommerce_single | woocommerce_thumbnail | woocommerce_gallery_thumbnail

My site creates these sizes for each image:
full | 474 x 720
woocommerce_single | 326 x 495
woocommerce_thumbnail | 216 x 216
thumbnail | 150 x 150
woocommerce_gallery_thumbnail | 100 x 100

So I can currently only use full and thumbnail in a newsletter.

Alternatively is there a way I can manually add additional sizes?
This could also be useful for anyone creating custom sizes.

Thanks for your help!

Kind regards,
JP