Is there any way to access other series in data_generator?

[Plug11]

Is there a way to access the values of other series in the charts in a data_generator?

I think the easiest way to describe this is through an example. In the following code, I have two series (representing heat generated and electricity consumption from a heat pump) which are aggregated using group_by and diff. I would like to be able to calculate the COP (heat/electricity) using the aggregated series, so the ratio is calculated for each element of the aggregated series.

type: custom:apexcharts-card
header:
  show: true
  title: Energy
  show_states: true
  colorize_states: true
series:
  - entity: sensor.heat_pump_electrical_energy
    name: elec
    type: column
    group_by:
      func: diff
      duration: 1hour
  - entity: sensor.heat_pump_heat_energy
    name: heat
    type: column
    group_by:
      func: diff
      duration: 1hour
### The following is illustrative pseudo code...
  -entity: XXX (not needed)
    name: COP
    data_generator: | # would need some code to do element-wise calculation of this ratio
      return series["heat"] / series["elec"] 

[Plug11]

I am new to apexcharts-cards (BTW, it looks great and very flexible!), but looking at the code and making some guesses, would what I am describing be possible if the GraphEntry class was given access to it's parent collection (i.e. ChartsCard._graphs object) in a similar way to which hass is passed in on this line:

apexcharts-card/src/apexcharts-card.ts

Lines 237 to 238 in 6601972

	this._graphs.map((graph) => {
	if (graph) graph.hass = hass;

then data_generator could be passed this collection as an additional argument?