根据字符串在键中的出现情况对json数组求和，并将其与字符串及其计数一起存储在单独的json数组中。

import json

def sum_json_array(json_array):
    # 步骤1：统计字符串在键中的出现次数
    count_dict = {}
    for obj in json_array:
        for key in obj.keys():
            if isinstance(obj[key], str):
                if obj[key] not in count_dict:
                    count_dict[obj[key]] = 1
                else:
                    count_dict[obj[key]] += 1
    
    # 步骤2和3：创建结果数组并存储字符串、计数和求和结果
    result_array = []
    for key, count in count_dict.items():
        sum_result = 0
        for obj in json_array:
            if key in obj.keys() and isinstance(obj[key], int):
                sum_result += obj[key]
        
        result_obj = {
            "string": key,
            "count": count,
            "sum": sum_result
        }
        result_array.append(result_obj)
    
    # 步骤4：返回结果数组
    return result_array

# 示例输入
json_array = [
    {"key1": "abc", "key2": 1},
    {"key1": "def", "key2": 2},
    {"key1": "abc", "key2": 3},
    {"key1": "ghi", "key2": 4},
    {"key1": "def", "key2": 5}
]

# 调用函数并打印结果
result = sum_json_array(json_array)
print(json.dumps(result, indent=4))

[
    {
        "string": "abc",
        "count": 2,
        "sum": 4
    },
    {
        "string": "def",
        "count": 2,
        "sum": 7
    },
    {
        "string": "ghi",
        "count": 1,
        "sum": 4
    }
]