Ah just realised I got muddled up with what kind of LEDs you are using.
I just presumed it was RGB LED strip lights that you stick on to places.
I use THESE to control my LEDs they apparently support 5v but I use 12v transformers to power them.
If them lights you have work the same as standard LEDs where you have a wire for each colour you could in theory snip the usb off then connect the wires to this controller and you could then control it directly through SmartThings.
But if it’s just a simple on/off led you may still be able to use this but only for turning it on and off through SmartThings.
Either way if you do fancy these you can only order them from China and they take about 4 weeks to arrive and once they arrive they don’t officially work with SmartThings some guy on here has created a firmware to flash the device which allows it to work.