That sounds like a problem that should be fixed in CSS. Ideally, it should be possible to specify that an image should have a width and/or max-width of 100vw, 100% of its parent, or whatever, taking box-sizing and paddings into account... and then specify that its height should be a certain percentage of its own width. The server already knows the aspect ratio, so it can deliver this information in a 'style' attribute.

I haven't been following the latest developments in CSS for a while, so maybe it's already possible to do this?