怎么把WPS表格数据转换为JSON格式的字符串
{"id":"120101","value":"和平区","parentId":"120100"},
{"id":"120102","value":"河东区","parentId":"120100"},
{"id":"120103","value":"河西区","parentId":"120100"},
{"id":"120104","value":"南开区","parentId":"120100"},
{"id":"120105","value":"河北区","parentId":"120100"},
{"id":"120106","value":"红桥区","parentId":"120100"},
{"id":"120110","value":"东丽区","parentId":"120100"},
{"id":"120111","value":"西青区","parentId":"120100"},
{"id":"120112","value":"津南区","parentId":"120100"},
{"id":"120113","value":"北辰区","parentId":"120100"},
{"id":"120114","value":"武清区","parentId":"120100"},
{"id":"120115","value":"宝坻区","parentId":"120100"},
{"id":"120116","value":"滨海新区","parentId":"120100"},
{"id":"120117","value":"宁河区","parentId":"120100"},
{"id":"120118","value":"静海区","parentId":"120100"},
{"id":"120119","value":"蓟州区","parentId":"120100"},