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In order to add preview field to your widget add a field like in example
<parameter name="widget_name_preview" xsi:type="block" visible="true" sort_order="30">
<label translate="true">Preview</label>
<block class="Magebit\WidgetPreview\Block\Adminhtml\Widget\PreviewWidgetField"/>
</parameter>
Preview images should be imported under /media/widget_preview/ and follow strict naming - %widget_id%_preview.png