Add custom field to change the region colors and store its value to the database

I want to replace the functionality of region color from selected color picker instead of that I want to add colors custom meta fields into custom post type to change the region colors and display that color on the front side.
I checked that default values stored inside the json when i tried to get decode that it will give an error because of the objects are not as string(inside quotes). Facing issue with some json objects are in single quotes and some has not quotes.

From where i can store or replace all objects in double quotes instead of single quotes.
Check the link of screenshot here: https://nimb.ws/eT1mDi