How can I use pass my own implemented COM interface to COM methods when allowMarshaling is false?

[0x5bfa]

Preface

I disabled allowMarshaling since I'd liked to make my app compatible with NativeAOT.
And I'm trying to implement one of COM interfaces and pass it to another COM interface's method.

{
    "$schema": "https://aka.ms/CsWin32.schema.json",
    "allowMarshaling": false
}

IFileOperation
IFileOperationProgressSink

Code

private class CFileOperationProgressSink : IFileOperationProgressSink.Interface
{
...
}

IFileOperation* pOp = default;
var sink = new CFileOperationProgressSink();

pOp.Advise(sink); // can't

How can I pass managed instance to unmanaged COM method?

[0x5bfa]

I think I find a way.

var pSink = Marshal.GetComInterfaceForObject(sink, typeof(IFileOperationProgressSink.Interface));
pOp.Advise((IFileOperationProgressSink*)pSink);

// This can be used if you're setting com site using IObjectWithSite.
var pSinkPtr = Marshal.GetIUnknownForObject(pSink);