FDM: Lack of capability to filter nodes based on edge clauses using GraphQL.

Imagine the Reporting Site and the Reporting Unit entities, 1 reporting site has N reporting units.

Currently, If I am in the Reporting Site entity, there is no way to filter reporting sites based on a reporting unit condition using graphql. 

Like: Give me reporting sites that have reporting units with the name "CLKVAM" to solve that , we need to go to the reporting unit level and query using a reverse edge

which makes data modeling and querying more complex ... sometimes we even need to do some transformations to remove duplicated data