Having a hell of a time trying to figure out the syntax to create a new Items chest that has a G36 w/ Mags and Scope already attached to the weapon. Anyone?

I see that you CAN do this for Vehicles using "Parts":

I've tried a few different things and here's where I landed w/ no-success:

{
"Name": "Expansion_G36",
"ContainerClassName": "SeaChest",
"Items": [
{
"ItemName": "Expansion_G36",
"NumberOfStacks": 1,
"StackSize": 1,
"Attachments": "Mag_Expansion_G36_30Rnd"
}
]
}