VSCode regex find & replace submatch math?

%s@{fileID: \(213[0-9]*\)@\='{fileID: '.(submatch(1)-1900)@

I am using this regex search and replace command in vim to subtract a constant from each matching id.

I can do the regex find in VSCode but how can I reference the submatch for maths & replace? submatch(1) does not work in VSCode?

Thanks.