Hi, I'm using this plugin with Netatmo healthy home coach to display CO2 measurements from my own apartment (testing the response as I enter the room, open the window etc) as an experiment to see if this data can be used to help businesses improve indoor ventilation to reduce covid risk.

Prototype http://covid-score.online/places/leons-flat/

I know there is a built in health index. I thought it would be cool if there could be a built in 'custom' derived parameter field where a function can be applied to a value to create a new value.

What I want to do ultimately is convert the co2 concentration to an airborne covid risk, this would factor in 3 things:

- The current co2 concentration
- The minimum concentration so far that day
- A custom factor for the 'activity' type expected (eating, talking, working out) 

By the way I really love this plugin, I'm a Meteorologist and I see features here which the company I work for has taken years to build things and they're no better than what is available here.

I'm open to hear thoughts on how this idea could be refined and if anyone has ideas on how to help.