Custom `string` to `bool` conversion

[aeb-kb01]

Is it possible to register a custom string to bool conversion?

[ExcelParameterConversion]
public static bool? StringToBool(string? value)
{
    value = value?.ToLowerInvariant();
    return value switch
    {
        "true" => true,
        _ => false,
    };
}

I tried above with bool? and string? (4 combinations) but all of them fail with #VALUE

The request may come weird but I am working on drop down support for intellisense and for bool types when user types TRUE exceltooltip window also pops up. I couldnt find a way to properly handle it and I think I shouldnt handle it so I was trying to fill the value as "TRUE" so exceltooltip wouldnt pop and tab completion etc would work better