db={"prices":[{"_id":"813f02ff-882e-44f7-b2bc-2f067427daf6","unit_amount":333,"currency":"USD","interval":"year","active":true}],"product":[{"_id":"3c46f277-8953-4f96-baf1-bd871ee3301f","name":"test","prices":["813f02ff-882e-44f7-b2bc-2f067427daf6","f5c76122-6132-4e4b-a26b-41bbd6325acc","3e4be68e-fbed-47f7-b871-92de72cb00df"]},{"_id":"3c46f277-8953-4f96-baf1-bd871ee3301g","name":"test",}]}

db.prices.aggregate([{"$lookup":{"from":"product","let":{"prid":"$_id"},"pipeline":[{"$addFields":{"prices":{"$ifNull":["$prices",[]]}}},{"$match":{"$expr":{"$in":["$$prid","$prices"]}}}],"as":"product_tbl"}}])