OK, I’m mostly coming up empty, but this thread might offer some clues to get them working:
I don’t want to oversimplify by suggesting you try the Sengled RGBW DTH and it will “just work” but stranger things have happened…(the DTH will be the groovy one in the following github dir/)…
Obi’s Sengled handler is the one that is being tinkered with in the before-mentioned thread.
Edit: I tried the Sengled DTH with a generic Zigbee RGBW bulb, and it works fine, with that , at least.
I would be interested to know if you have any luck with it.