Create CGColorSpace from CFPropertyList

I am trying to create a custom CGColorSpace in Swift on macOS but am not sure I really understand the concepts.

I want to use a custom color space called Spot1 and if I extract the spot color from a PDF I get the following:

                    "ColorSpace<Dictionary>" = {
                        "Cs2<Array>" = (
                            Separation,
                            Spot1,
                            DeviceCMYK,
                            {
                                "BitsPerSample<Integer>" = 8;
                                "Domain<Array>" = (
                                    0,
                                    1
                                );
                                "Filter<Name>" = FlateDecode;
                                "FunctionType<Integer>" = 0;
                                "Length<Integer>" = 526;
                                "Range<Array>" = (
                                    0,
                                    1,
                                    0,
                                    1,
                                    0,
                                    1,
                                    0,
                                    1
                                );
                                "Size<Array>" = (
                                    1024
                                );
                            }
                        );
                    };

How can I create this same color space using the CGColorSpace(propertyListPlist: CFPropertyList) API

func createSpot1() -> CGColorSpace? {

    let dict0 : NSDictionary = [
        "BitsPerSample": 8,
        "Domain" : [0,1],
        "Filter" : "FlateDecode",
        "FunctionType" : 0,
        "Length" : 526,
        "Range" : [0,1,0,1,0,1,0,1],
        "Size" : [1024]]
    
    let dict : NSDictionary = [
        "Cs2" : ["Separation","Spot1", "DeviceCMYK", dict0]
            ]
    
    let space = CGColorSpace(propertyListPlist: dict as CFPropertyList)
    
    if space == nil {
        DebugLog("Spot1 color space is nil!")
    }
    
    return space
}