Create Separate Image Sitemaps
Currently, it appears Hubspot doesn't create or allow the creation of a separate image sitemap. This would be useful for many reasons but primarily to allow the submission of an image sitemap through Google Search Console.
This would be beneficial both in aiding image discovery and in getting a metric on how many images Google has indexed vs the total number of images submitted via the sitemap.
Such a feature could be further enhanced by allowing sitemaps to be broken up by content type in a similar fashion to the Wordpress Yoast SEO plugin e.g. page sitemap, post sitemap, image sitemap, along with a sitemap index file.