Special Characters is not useful in config file like +

[anonymous_user_5769a285]

are there anyone knows how to use the Special Characters like “+.” to set N values to the same key in .ini files?
I tried use these code to add :

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   const TCHAR* Section = TEXT("/Script/UnrealEd.EditorLoadingSavingSettings");
    const TCHAR* Key = TEXT("+AutoReimportDirectorySettings");

    FText value_text = FText::Format(LOCTEXT("Config_Value", "(SourceDirectory=\"{0}\",MountPoint=\"{1}\",Wildcards=)"),
		FText::FromString(filePath_str),
		FText::FromString(mountPath));
	const TCHAR* Value = *value_text.ToString();
	GConfig->SetString(Section, Key, Value, GEditorPerProjectIni);
	GConfig->Flush(false, GEditorPerProjectIni);

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but the .ini file was always had only one map like “AutoReimportDirectorySettings”,how can I update file like these:

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thanks very much if there is anyone can help me !