Lookup operations

Does anybody knows if mongo have plans to run the lookups more eficiently?.

I love the denormalized model but some times is easier to reference some documents from other collections using $lookup and it’s quite expensive for mongo because it loops through all the elements in the left collection.

I saw that in mongo 6.0 they optimize the lookup stage, my question is: Does Mongodb have any plans of integrating hash lookups in the near future?.