Solar Voltage Monitor

I am trying to get an analog voltage divider to display the voltage of my homebrew solar system to HA. I got the raw data into HA from the divider using Sonoff-Tasmota FW but I can’t figure out how to apply the formula to HA to display the voltage properly.

Can anyone help with this? I just need to know how to input my formula to convert the output of the divider from 199 to show the 3.3v it actually is.

Thanks ahead of time for any replies, any help is greatly appreciated and if I missed another post that asks the same question please forgive me…

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What you need to do is create a template sensor to do the maths to scale your value