YoLink used to support 3rd-party developers, but no longer. They used to provided their devices to developers for free. I'm already out several hundred dollars because earlier this year they told me they would continue our agreement (I'd buy; they would refund) and then they completely ignored me after I purchased multiple devices! 
Most of the drivers I developed were created because I was provided free devices; so I did the development for free even though I didn't use that particular device.
Since YoLink will no longer provide devices for testing, I can't afford to buy a $300 device that I'll never use just to develop a driver. The easiest way for me to create the driver is if you were willing to ship me the meter and also pay to ship it back to you. Not a practical solution if it's already installed in your plumbing.
Otherwise, I can probably walk you through a procedure that you can use to get me the information I need to create one, although I won't be able to test it.
It may take a lot of work on your part gathering log messages and editing the driver as we work through it. If you don't think you have the necessary skills - like copying and pasting log entries and editing device drivers - then you may not want to start this.
If you want to continue working with me to create one:
First thing necessary would be to have the meter paired with your YoLink hub and working correctly. Not necessarily physically installed, just available to the YoLink hub. Insure it's using the latest firmware via the YoLink app.
Next step would be to use the YoLink Device Service app on your HE to select and try to install it. You will get an error stating the name of the missing driver. That name is the first thing I need to start the driver creation.
