We have started working on RFC for it and currently looking at the similar requests and ways to best support them in GraphQL. As we have graph database behind the GraphQL which already have support for nested filters, we just need to correctly map them in GraphQL.
This can take some time because we need to efficiently rewrite the GraphQL query to DQL for every possible scenarios. Our target is to include this in 21.07 (releasing in July). Once we have this added in GraphQL it will be fast and efficient than other options which have SQL or any other db to run GraphQL query because on those db’s they need to perform the join operation to get nested result which is very costly.
Thanks for your detailed feedback .