Since they are proprietary I say no not ever. There are no 850W or 1000W or 1500W options only 360W and 500W. [URL]        
I have an old model XPS desktop, it comes with a standard power supply. Recently, I purchased a 8940 model but I found it has a non-standard power supply. I'm really want to update my graphic card to RTX 30 series, but now I found I even can't change the power supply. Anybody can teach me how to modify it? Thanks a lot. 
XPS 8940, any chance to upgrade power supply?