怎么修改JSON文件中的字段再保存到JSON文件里

现在用提取JSON能得到下面文件的字段：

{"id":"LIQ6YJUG0LWPG","name":"Mac Studio Video","size":25921908,"btime":1686413338375,"mtime":1686413338398,"ext":"mp4","tags":[],"folders":[],"isDeleted":false,"url":"https://www.apple.com/macbook-air-13-and-15-m2/","annotation":"","modificationTime":1686413338360,"width":1920,"height":1080,"resolutionWidth":1920,"resolutionHeight":1080,"duration":63.35,"palettes":[{"color":[251,251,251],"ratio":79},{"color":[112,112,112],"ratio":6},{"color":[168,168,173],"ratio":4.92},{"color":[188,188,193],"ratio":2.72},{"color":[207,207,208],"ratio":2.24},{"color":[196,196,196],"ratio":2.17},{"color":[132,132,132],"ratio":1.18},{"color":[34,34,34],"ratio":0.65}],"lastModified":1686413345684}

但是不知道怎么修改并保存回源文件中