Get children with filter in Waapi query (C++)

Question

Hello,
I got that AkJson which works, but I want to add a filter to it to only get Queries.

AkJson arg(AkJson::Map{
            {
                {"from", AkJson::Map{{ "id", AkJson::Array{ AkVariant(guid) }}}},
                {"transform", AkJson::Array{ AkJson::Map {{"select", AkJson::Array{ AkVariant("children")}}}}}
            }});

The WAQL command would be: $"\Queries" select descendants where type="Query"

Could somebody pls tell me how to achieve that?

Best Regards