Of course there is!
You would look for the proper water cooling block for your GPU (frozencpu.com is a good place to at least get an idea of what you need). After that, you'll need a water pump, water tank, tubing, and fittings.
If you're looking for a nice simple all in one solution like you have for your CPU, Asetek sells some but they're only for the high end Nvidia 5xx series cards. As far as I know, they don't have anything for any AMD cards.
Thank you for info!
But I thought that normally I'd have to connect the pump to the processor, right? Where could I install it if my CPU is already taken by H100?
Oh nvm, I think I start getting the idea:) Now just need to get a right size fittings and radiator.