如何通过两个独立查询依赖于父查询来通过mongoose进行查询？

var EmpSchema = {_id:String, empName:String}
var ProjectSchema = {_id:String, projectName}
var reportSchema = {empId:String, projectId:String, comments:String}
//These are two many to many relations
var EmpSchema = {_id:String, empName:String}
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