Images that are included into instructions via {artifact.<name>} syntax should allow a underlying LLM for image processing/interpeting.

## 🔴 Required Information

### Is your feature request related to a specific problem?
I'm always frustrated when I have to manually handle putting artifacts back to Content to enable underlying LLM image processing.

### Describe the Solution You'd Like
It would be nice to be able to just add image to content via including in a LLMAgent instuction {artifact.