Any HDMI cable you’ve bought in the last few years is likely to be of the High Speed variety. This unfortunate name describes cables that can handle 1080p video and above. Chances are these cables will work for 4K and even 4K HDR. They are, essentially, a dumb pipe.
You don’t need “special” HDMI cables to transmit HDR content. You just need a big enough pipe to handle the data. Over short distances, say six feet or around 2 meters, most cables will be fine. For longer distances the cable has to be a bit better made in order to work. But “better made” doesn’t have to mean “expensive.”
Definitely don’t fall for the special cable thing. I’m using cables that I picked up for a few bucks a piece at Tuesday Morning a couple of years ago to wire up my 4K gear and they’re fine.