Image widget/dynamic image loading

First of all, thanks for this amazing project!
This is probably more a question, but I was wondering if there is an option to create an image widget directly or draw into an image resource?
My use case would be to download images dynamically and insert them into the UI or render a 3d object into a texture inside the UI.
I've seen the latest release notes from 0.5.0 and was excited about `Thyme images can be defined without requiring an actual image on disk` - but I could not find out how this can actually be done. Thanks in advance!