Function Load Wagons

Is it possible to load a wagon with the TSW HTTP API? The "Function.UnloadAll" request works which makes me think the opposite is possible with a "Function.Load" request?

Here's a successful "Function.UnloadAll" request response:

Code:

{
    "ReturnValue": true,
    "OutCargoUnloaded": {
        "cargo":"CargoAsset'/RuhrSiegNord/Scenarios/Common/Lumber.Lumber'",
        "numberOfUnits": 1
    }
}

I've tried to pass these values back in various formats with a "Function.Load" request without luck e.g.

Code:

?Value={"cargo":"CargoAsset'/RuhrSiegNord/Scenarios/Common/Lumber.Lumber'","numberOfUnits":1}

For reference the "Cargo (CargoModel)" component had these end points:

Code:

• Function.GetComponentTickInterval
• Function.GetCurrentMass
• Function.GetFillLevel
• Function.GetMaxCapacityInUnits
• Function.GetNumberOfUnits
• Function.IsActive
• Function.IsBeingDestroyed
• Function.IsComponentTickEnabled
• Function.IsEmpty
• Function.IsFull
• Function.Load
• Function.UnloadAll
• Function.UnloadSelection
• ObjectClass
• ObjectName
• Property.InLoadingRange
• Property.bAutoActivate
• Property.bIsEditorOnly
• Property.bReplicates

The official TSW HTTP API pdf can be found here: https://forums.dovetailgames.com/threads/train-sim-world-api-support.94488/