I'm not sure how this can be done or is it possible, but on Ghost we have many image sizes depending on device and screen size, e.g.:
w300: https://cms.vokabula.com/content/images/size/w300/2021/04/blog5-7-problema-kod-u-enja-njema-kog-2.png
w600: https://cms.vokabula.com/content/images/size/w600/2021/04/blog5-7-problema-kod-u-enja-njema-kog-2.png

However, on headless cms there is only one image size, original one, e.g.:

https://cms.vokabula.com/content/images/2021/04/blog5-7-problema-kod-u-enja-njema-kog-2.png

If we have +100 articles, this can cause heavy page size, e.g.:

https://postimg.cc/gallery/rMJWYzX

PS. images have been optimised and reuploaded to ghost image directory, but still too heavy...

Do you think this is possible, styxlab?