如何在Julia中初始化/构造深度嵌套结构？

nested_structure = Dict(
    "key1" => "value1",
    "key2" => [
        "subkey1" => "subvalue1",
        "subkey2" => [
            "subsubkey1" => "subsubvalue1",
            "subsubkey2" => "subsubvalue2"
        ]
    ]
)

struct NestedStructure
    key1::String
    key2::Vector{SubStructure}
end

struct SubStructure
    subkey1::String
    subkey2::String
end

nested_structure = NestedStructure(
    "value1",
    [
        SubStructure("subvalue1", "subvalue2"),
        SubStructure("subvalue3", "subvalue4")
    ]
)