How to add aggregation options in multiple lookup

Working with Data
,
1

Hi,

I’m trying to apply an additional filter to the lookup method with MongDb driver, but I cannot find a way to do that. I would like to filter the Sections collection by Name.

var rRangesV2 = 
    rmInstrumentsCollection.Aggregate().Match(x => x.rpName == "PPMU660")
        .Lookup("Submodules", "_id", "rpBoardID", "asSubmodules")
        .Lookup("Sections", "asSubmodules._id", "rpSubModuleID", "asSections")
        .Lookup("Functions", "asSections._id", "rpSectionID", "asFunctions")
        .Lookup("Ranges", "asFunctions._id", "rpFunctionID", "asRanges")
        .ToList();

Thanks in advance,