Add JSON manipulation functions %str2json , %json add , %json remove with immutability

Add JSON manipulation functions %str2json , %json add , %json remove with immutability: a task in LegoFlow-SWE (Harbor dataset). PlantUML's preprocessor currently lacks the ability to dynamically create and manipulate JSON structures. Users need to generate JSON data structures dynamically, add…

The task

PlantUML's preprocessor currently lacks the ability to dynamically create and manipulate JSON structures. Users need to generate JSON data structures dynamically, add elements to existing JSON arrays or objects, and remove elements from them. Moreover, any functions that operate on JSON must not unexpectedly mutate…

Part of Lego-X/LegoFlow-SWE.