Clone and customize OH default widgets?

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my blinds have two Rollershutter items for blinds and lamella positions. I’d like to convert the lamella control widget (oh-rollershutter-item) to act as oh-stepper-item. a press on “UP/DOWN” buttons should change the item between 0-25-50-75-100. one way to achieve this is to simply assign the stepper-item widget to the rollershutter item but the design looks like this:
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I found hints to recreate YAML from the vue definition openhab-webui/oh-rollershutter-item.vue at ed342e4ae7919ec7b17ba7dd8251307e591b4587 · openhab/openhab-webui · GitHub
but thats far to high for me…
can someone do a small how-to for customizing default widgets, maybe this could be of interest for others too…
thanks in advance!

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There’s a pretty good doc page to get you started: