如何使用给定的键将文本文件转换为json？

import json

def convert_text_to_json(file_path, key):
    # 读取文本文件
    with open(file_path, 'r') as file:
        text_content = file.read()

    # 解析文本内容
    data = {}
    lines = text_content.split('\n')
    for line in lines:
        if line.strip() != '':
            parts = line.split(':')
            if len(parts) == 2:
                data[parts[0].strip()] = parts[1].strip()

    # 创建JSON对象
    json_data = {key: data}

    # 将JSON对象转换为JSON字符串
    json_string = json.dumps(json_data)

    # 将JSON字符串写入文件
    with open('output.json', 'w') as file:
        file.write(json_string)

# 示例调用
convert_text_to_json('input.txt', 'data')