Show difference of 2 sensors in a bar graph

[Jn115759]

I currently have a nice bar graph with 2 helper utility sensors resetting daily (see below).

However, I would like a bar graph with only the difference between both of them (the red piece).
{{ (states('sensor.helper_elektriciteit_aanvoer_net')|float - states('sensor.helper_elektriciteit_terugvoer_net')|float)|round(2)}}
Can this be done without creating an additional template sensor as part of the graph definition ?

Many thanks in advance for helping me out!

type: custom:plotly-graph
entities:
  - entity: sensor.helper_elektriciteit_aanvoer_net
    statistic: state
    period: day
    type: bar
    width: null
  - entity: sensor.helper_elektriciteit_terugvoer_net
    statistic: state
    period: day
    type: bar
    width: null
hours_to_show: 168
refresh_interval: 30
title: Energy

[comkubus7]

I would like to now if this is possible too.:-)

[dbuezas]

You bet!

Search for store_var in the readme :)
Let me know if you need help

[comkubus7]

That help! Thanks a lot.:-)