[{"_id":ObjectId("64100b43317d38bfe6238deb"),"email":"email@google.com","is_active":true,"stage_id":2,"panel_members":{"2":["33190069-4166-43f4-9d89-04c8ce13d459","43190069-4166-43f4-9d89-04c8ce13d458"],"3":["53190069-4166-43f4-9d89-04c8ce13d459","63190069-4166-43f4-9d89-04c8ce13d458"],"4":["73190069-4166-43f4-9d89-04c8ce13d459","83190069-4166-43f4-9d89-04c8ce13d458"],}}]

db.collection.aggregate([{$set:{panel_members:{$objectToArray:"$panel_members"}}},{$set:{panel_members:{$filter:{input:"$panel_members",cond:{$eq:["$$this.k",{$toString:"$stage_id"}]}}}}},{$match:{$expr:{$in:["43190069-4166-43f4-9d89-04c8ce13d458",{$first:"$panel_members.v"}]}}},{$set:{panel_members:{$arrayToObject:"$panel_members"}}}])