json_encoder.py

import json

class Color:
    name = None
    found_in = None

    def __init__(self, name) -> None:
        self.name = name


def custom_encoder(obj):
    json_result = {}
    for k,v in obj.__dict__.items():
        segments = k.split("_")

        if len(segments) == 1:
            json_result[k] = v
            continue

        new_key = segments[0] + segments[1].capitalize()
        json_result[new_key] = v
    
    return json_result


red = Color("RED")
red.found_in = "soil"

result = json.dumps(red, default=custom_encoder)
print(result)