Hi @Nico_Braun , currently we don’t support combining root and nested level fields in filters. You have to do it via custom DQL queries as of now because we can write such queries in DQL.
This feature is requested by many other users , and there are proposals for the implementation also .Proposal Nested Object Filters for GraphQL rewritten as var blocks in DQL
We will discuss it with team and try to add this in future , probably in next release.
Thanks.