在序列化字典时，有没有办法指定每个Json头的名称？

import json

class MyEncoder(json.JSONEncoder):
    def default(self, obj):
        if isinstance(obj, dict):
            return {'custom_header': obj}  # 定义自定义的Json头名称为'custom_header'
        return super().default(obj)

my_dict = {'key1': 'value1', 'key2': 'value2'}
json_str = json.dumps(my_dict, cls=MyEncoder)
print(json_str)

{"custom_header": {"key1": "value1", "key2": "value2"}}

from marshmallow import Schema, fields

class MySchema(Schema):
    custom_header = fields.Dict()

my_dict = {'key1': 'value1', 'key2': 'value2'}
schema = MySchema()
json_str = schema.dumps({'custom_header': my_dict})
print(json_str)

{"custom_header": {"key1": "value1", "key2": "value2"}}