Increase or decrease X degrees based on current set-temp

Configuration
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1

Hi all,

I have made an automation that lower my floor heating at night and up it in the morning. And this is working fine until i change the set-temp.

So what i am wondering is. How can i make this automation adjust my set-temp +/- X degrees based on the current set-temp?

hvac_modes:
  - 'off'
  - heat
min_temp: 5
max_temp: 35
current_temperature: 25
temperature: 20 <--------------This one
current_humidity: 24.2
hvac_action: idle
friendly_name: Stue
supported_features: 1

I assume i have to use some sort of template, but thats where my skills are limited.

alias: Nattsenking gulvvarme stue
description: ''
trigger:
  - platform: time
    at: input_datetime.nattsenking_natt
    id: '1'
  - platform: time
    at: input_datetime.nattsenking_morgen
    id: '2'
condition:
  - condition: state
    entity_id: climate.general_thermostat_v2_mode
    state: heat
    attribute: hvac_modes
action:
  - choose:
      - conditions:
          - condition: trigger
            id: '1'
        sequence:
          - service: climate.set_temperature
            data:
              temperature: 20
            target:
              entity_id: climate.general_thermostat_v2_mode
      - conditions:
          - condition: trigger
            id: '2'
        sequence:
          - service: climate.set_temperature
            data:
              temperature: 22
            target:
              entity_id: climate.general_thermostat_v2_mode
    default: []
mode: single