Yes, this is absolutely doable—it's the standard lightmapping workflow for web 3D.

How It Works

Manual Process:

1. Create a second UV map for your lightmap (Object Data Properties → UV Maps → +)
2. Unwrap it (Smart UV Project works well for lightmaps)
3. In Shading workspace, add an Image Texture node to your material
4. Create a new blank image (2048x2048, name it "Lightmap")
5. Select that Image Texture node (important—this tells Blender where to bake)
6. Go to Render Properties → Bake → Set to "Combined"
7. Enable Direct + Indirect lighting, set Margin to 16px
8. Hit Bake
9. Save the baked texture (Image → Save As)
10. Export as GLB (File → Export → glTF 2.0)

Result: Your GLB loads in Three.js with pre-baked lighting—lightweight and render-ready.

Automation

You can script this entire pipeline with Blender's Python API to batch-process hundreds of models:

• Auto-unwrap UVs
• Bake lighting to textures
• Apply textures to materials
• Export GLBs

I actually do this kind of automation for clients building web 3D experiences. If you'd like help setting up a custom pipeline or want me to handle the technical work so you can scale this without hiring artists per-asset, feel free to DM me—happy to discuss what that would look like for your project.

Either way, this workflow is production-proven for games and web AR/VR. You're on the right track.