apexCharts transfom with eval external entity

Hi,

I’m trying to add some a operation with transform in the apexCharts but I’m not able to read a different entity inside
here the example:

type: custom:apexcharts-card
graph_span: 1d
header:
  show: true
  title: Energy Breakdown (Today)
  show_states: true
  colorize_states: true
chart_type: donut
series:
  - entity: sensor.solarman_today_grid_consumption
    name: From Grid
    color: "#FF5733"
  - entity: sensor.solarman_battery_daily_discharge
    name: From Battery
    color: "#3366FF"
  - entity: sensor.solarman_today_power_consumption
    name: From Solar
    color: "#00FF00"
    transform: "return x - (sensor.solarman_battery_daily_discharge);"

with the last line as the problatic one,
thanks