Searchable Paint-by-Number Kit Feature

I’m exploring a searchable paint-by-number kit feature that would help users quickly locate all areas for a given number on their physical canvas. Paint-by-number companies already convert images into numbered patterns; I want to understand how feasible it is to extend that process so the result is searchable, such as digitally highlighting all regions for a chosen number or providing coordinates or grids. I’m looking for a developer who can assess feasibility, suggest an approach, and build a simple web tool for testing this concept.