Can't use GPU for image processing (RTX 2080)

I am getting tired paying for a software that is running really slow. It appears almost unusable to edit GFX100 and Leica Q2 photos on my computer. I spent some times today to try to fix the slowliness, and found out that GPU support is partially supported. Thing is, there is no reason a GFX 2080 couldn't be used to image processing.

Today, I checked the performance settings, and I can't enable GPU for Image processing, despite having an AMD Ryzen 2700x.

and an RTX2080. 

Please advice,