C# class property with "two types"

I there any way in c# to create a property which will be basically a bool but can be set via string?
What I want to achive is simple:

string stringValue = "true";
object.BoolValue = stringValue ;
bool boolValue = object.BoolValue;

My idea was using get; set; but it always crashes on conversion. I can convert that string in object constructor but what if I want to change it later? Do I need a separate method for conversion (it is not only "true"/"false" but in that setter there should be a list of true values and false values and the rest is argument exception)?

Thanks for any ideas on how to achive this.

UPDATE: Code from OPs comment

private bool _readOnly;

public bool ReadOnly {
    get => _readOnly;
    set => _readOnly = Convert.ToBoolean(value);
}

public DeviceProperty(string readOnly) {
    ReadOnly = readOnly;
}

>Solution :

You can’t modify built-in types but you can create a new type that defines Implicit Operator inside and you can set both string and bool to this type.
https://learn.microsoft.com/en-us/dotnet/csharp/language-reference/operators/user-defined-conversion-operators

Also you can define an Explicit operator too, to cast your object to both of types without actually casting.

public struct MyBoolString
{
    private bool _value;

    public static implicit operator MyBoolString(bool value)
    {
        return new MyBoolString { _value = value };
    }

    public static implicit operator bool(MyBoolString value)
    {
        return value._value;
    }

    public static implicit operator MyBoolString(string value)
    {
        return new MyBoolString { _value = bool.Parse(value) };
    }

    public static implicit operator string(MyBoolString value)
    {
        return value._value.ToString();
    }
}

Then you can use it like that

MyBoolString myBoolString = "true";
myBoolString = true;

bool myBool = myBoolString;
string myString = myBoolString;

And as a property:

public MyBoolString Foo { get; set; }