Choose Row Background Image Crop

Hi there, when choosing a background image for a row/cell in Page Builder, there are options for the background-size property, but it would be great if we could also choose which version of an image is used for this (ie. Thumbnail, Medium, Original, theme sizes etc.).

Currently my only option for this is to set the background-image in custom CSS, or find out the URL of the different theme-generated image crops and paste it in the ‘External URL’ field.

The SiteOrigin Image widget currently lets us choose from all the theme image sizes, so a similar dropdown here would be very useful, to save always having to load the largest filesize.