Displaying delta-values in charts?

Setup, Configuration and Use Items & Sitemaps
2

Yes there is. You need to add an aggregate-series on the page configuration.
See example here:

config:
  chartType: day
  label: Wasserverbrauch
  period: D
  sidebar: true
  visibleTo:
    - role:administrator
slots:
  grid:
    - component: oh-chart-grid
      config: {}
  series:
    - component: oh-aggregate-series
      config:
        action: analyzer
        actionAnalyzerChartType: day
        actionAnalyzerItems:
          - Wasser_Zaehlerstand
        aggregationFunction: diff_last
        dimension1: hour
        gridIndex: 0
        item: Wasser_Zaehlerstand
        name: Wasserverbrauch
        type: bar
        xAxisIndex: 0
        yAxisIndex: 0
  xAxis:
    - component: oh-category-axis
      config:
        categoryType: day
        gridIndex: 0
        monthFormat: default
        weekdayFormat: default
  yAxis:
    - component: oh-value-axis
      config:
        gridIndex: 0
        name: Liter
        nameLocation: end
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