Exterior Multi colour print

Hello everyone!

Like to seek some advise on using Bambu studio. How do we create the option to print Filament A on the exterior, while Filament B as the interior.

I wanted to print using PLA Tough as the main structure while printing PLA wood as the exterior for it to be aesthetically pleasing. But the colour painting options doesnt seem to support this.

Hope to get some help here!

Imagine to print a transparent bust with a red heart shaped infill part