is it somehow possible to get a full srcset when using {{item.image_width}} ?

when i use 

<img width="{{item.image_width}}" height="{{item.image_height}}" src="{{item.image}}">

i get this in compiled code:

<img width="1200" height="800" src="path/to/image.jpg">

but i would like to get a scrset like:

<img width="693" height="693" 
    src="   path/to/image.jpg" srcset="path/to/image.jpg 693w, 
            path/to/image-300x300.jpg 300w, 
            path/to/image-150x150.jpg 150w" 
    sizes="(max-width: 693px) 100vw, 693px">

to deliver different image sizes to different devices...