Trend slider to show transformed value

  • Platform information:
    Hardware: RPi4, 2GB RAM
    Java Runtime Environment: Zulu 11.0.14
    openHAB version: 3.4.2
    configuration mostly with textfiles except for UI
  • Issue of the topic:
    From my heatpump I receive a numerical value for the operating status of the equipment. This value is stored and can be called into a trend.
    All fine and working.
    I would like the slider (which shows the values of the various trendlines when hovered over the trend) to show a string rather the number for this item. E.g. number is 19 but the slider should show HEATING.
    In the transform directory I already have a mapfile which transforms number to strings.
    But how to apply the map to the trend slider only.
    I want to keep the numbers as storage item.