Add a product into an existing hero shot composition

I have a brand hero shot (a styled scene) and I want to drop a specific product into it without re-shooting.

In Nano Banana, upload both the hero scene AND the product photo.

The hero scene: {{hero_scene}}
The product to add: {{product}}
Where in the frame the product should sit: {{placement}}
The product's role in the composition (lead / supporting / cameo): {{role}}
Scale of the product relative to scene elements: {{scale}}
Lighting cues from the hero (so the product matches): {{light_match}}
Aspect ratio of the final: {{aspect}}

Tell Nano Banana:

Take the {{product}} from the second image and add it into the {{hero_scene}} at {{placement}} as a {{role}} element.

- Match the {{light_match}} so the product is lit consistently with the scene.
- Scale the product to {{scale}}, not too big, not too small.
- Add a grounded shadow that matches the scene's light direction.
- Maintain the original composition of the hero scene as much as possible. The product is being added, not replacing the focal point.
- Do not warp or recolour the product.

Output at {{aspect}}. After the image, suggest one small adjustment to the composition (e.g. shift the product 5% left, soften the shadow) that would land better.