[Feature] soil_moisture
### Problem description

I own  a [DIYRuZ_Flower](https://z2m.dev/devices/diyruz/diyruz_flower.html) - Device.
It exposes "soil_moisture" and this I not yet supported by HomeKit.
Ist there any chance to expose it as "humidity"?



### Suggested solution

Maybe add the capability to "convert" own exposed characteristic to another?

### Alternative solutions

_No response_

### Additional context / information

I tried a lot of stuff already but the documentation of  the plugin configuration is not too much ;) 

Thank you very much!