Database
db={"products":[{"_id":"655c3285822c4a52150c30a7","name":"Bag Product","variants":[{"variant_name":"Full Case","attributes":[{"attribute_name":"Slots","options":[{"name":"0.18"},{"name":"0.22"}]},{"attribute_name":"Test Slot","options":[{"name":"s1"}]}]}]},{"_id":"655c3285822c4a52150c30ab","name":"Kit Product"}]}
Query
db.products.find({"name":"Bag Product"},{variants:{$elemMatch:{variant_name:"Full Case"}}})