Hello,
Indeed, I started with Yeelight. I was going to leave a small message on the forum, but with this sun, I must admit I spent quite a bit of time in the garden rather than on the PC 
On the server side, I only coded the part for searching for bulbs on the network. And on the front end, as far as I remember, I had added the image in the integration part and the search page.
I get the impression that you’ve already gone much further than me on the subject, judging by your PR.
For the front end part, you can take a look at what I did with Milight (https://github.com/GladysAssistant/Gladys/pull/647), which is based on Philips Hue.