OH3 widget - item from props not working

Setup, Configuration and Use Items & Sitemaps
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1

I am building a widget that shows the temperature and humidity in a chart.
I also wanted to add the state(open/closed) of a window into it.
Everything worked fine till I wanted to add the window sensor item via props. The item don’t get resolved.

See line 110 in the example below. Calling the item directly by its name does the job, configuring it in props not.
I tried =props.window_item and =items[props.window_item].

yaml 
uid: chart
tags: []
props:
  parameters:
    - context: item
      description: Temperature Item shown in chart
      label: Temperature Item
      name: temperature_item
      required: true
      type: TEXT
      groupName: chartItems
    - context: item
      description: Humidity Item shown in chart
      label: Humidity Item
      name: humidity_item
      required: true
      type: TEXT
      groupName: chartItems
    - context: item
      description: Window Sensor Item shown in chart
      label: Window Item
      name: window_item
      required: false
      type: TEXT
      groupName: chartItems
    - description: Room name
      label: Room name
      name: roomName
      required: true
      type: TEXT
      groupName: general
  parameterGroups:
    - name: general
      label: General settings
      description: Most important widget settings
    - name: chartItems
      label: Items on chart
      description: Items on chart
timestamp: Jun 2, 2021, 10:37:42 AM
component: f7-card
config: {}
slots:
  default:
    - component: oh-chart
      config:
        label: =props.roomName
        periodVisible: false
      slots:
        grid:
          - component: oh-chart-grid
            config:
              show: true
              left: 50
              right: 50          
        xAxis:
          - component: oh-time-axis
            config:
              gridIndex: 0
        yAxis:
          - component: oh-value-axis
            config:
              gridIndex: 0
              name: Temperatur
              min: 17
              max: 30
              axisLabel:
                formatter: "{value} °C"
          - component: oh-value-axis
            config:
              gridIndex: 0
              name: Luftfeuchtigkeit
              min: 30
              max: 100
              axisLabel:
                formatter: "{value} %"
        series:
          - component: oh-time-series
            config:
              name: Temperatur
              gridIndex: 0
              xAxisIndex: 0
              yAxisIndex: 0
              type: line
              item: =props.temperature_item
              smooth: true
              color: green
          - component: oh-time-series
            config:
              name: Luftfeuchtigkeit
              gridIndex: 0
              xAxisIndex: 0
              yAxisIndex: 1
              type: line
              item: =props.humidity_item
              smooth: true
              color: blue
          - component: oh-time-series
            config:
              name: Fenster
              gridIndex: 0
              xAxisIndex: 0
              yAxisIndex: 0
              type: line
              color: red
            slots:
              markArea:
                - component: oh-mark-area
                  config:
                    name: Fenster
                    item: =props.window_item #Fenster_Sensor_Wohnzimmer_Rechts
        legend:
          - component: oh-chart-legend
            config:
              show: true
        tooltip:
          - component: oh-chart-tooltip
            config:
              show: true
        dataZoom:
          - component: oh-chart-datazoom
            config:
              show: true
              type: slider
              orient: horizontal
              start: 50
              end: 100
              xAxisIndex:
                - 0
                - 1
2

The only solution I can think of, is creating a new widget for every item or create the page in “code View” without the need of AC predefined widget.

Is this intentional or worth creating a issue on GitHub?