这下边有示例呢
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https://help.fanruan.com/finereport/doc-view-1287.html 或者参考文档
参考
数据集参数方式实现下拉复选框多选查询 https://help.fanruan.com/finereport/doc-view-1287.html
in('${replace(控件名,",","','")}')
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PS,分隔符是,
--多选框
${IF(len(参数)=0,""," AND 字段名 in ('"+参数+"')")}