How can I handle paths with flutter and CustomPainter

Question

I've created an app where you can fill objects with color, this is my process...

1. Convert to curves an image
2. Save it in SVG
3. Convert the SVG to code (https://fluttershapemaker.com)
4. from the class RPSCustomPainter I have to make a class for each path (150 paths at least) to handle these from main file and color fill it

In step 4 it takes me approximately 3-4 hours (and I need convert 7 images more), will there be an easier or faster way?

if you need me to put part of my code let me know, thanks!