CGContext PDF/A intents

let dic : [AnyHashable:Any] = [
        kCGPDFXRegistryName: "http://www.color.org" as CFString,
        kCGPDFXOutputConditionIdentifier: "FOGRA43" as CFString,
        kCGPDFContextOutputIntent: "GTS_PDFX" as CFString,
        kCGPDFXOutputIntentSubtype: "GTS_PDFX" as CFString,
        kCGPDFContextCreateLinearizedPDF: "" as CFString,
        kCGPDFContextCreatePDFA: "" as CFString,
        kCGPDFContextAuthor: "Placeholder" as CFString,
        kCGPDFContextCreator: "Placeholder" as CFString
        
    ]

Hello,

Now I would like to export my PDF's as PDF/A. In my opinion, there is also the right option for this under Core Graphics. Unfortunately, the documentation does not show what is 'kCGPDFContextCreatePDFA' or 'kCGPDFContextLinearizedPDF' for a stringvalue is required.

What I have already tried: GTS_PDFA1 , PDF/A-1, true as CFString. (Above my CFDictionary. ...Author e.g are working perfectly.)

In the Finder you can see these two options, which I would also like to implement in my app.

Thank you in advance!