Question Can we do this with a custom formatter?

So I have this:

Code (csharp):

1.  
2. "Time is {0} for white and {1} for black"
3. "Time is {0} for both sides"
4.  

I know I can do it with 2 smart strings but I was wondering if I could write a custom formatter that could handle both cases. The second one is naturally for when black time == white time.

 

Yes I can do it with 3 parameters, I didn't figure out how to pass directly wtime==btime in the conditional statement.

"Time is {0:{1} for both|{1} for white and {2} for black}"

Code (csharp):

1.  
2.    label.text = messageFmt.GetLocalizedString( wtime==btime, wtime, btime);
3.