Setka Editor plugin supports standard Magento widgets. you can insert them via Insert Widget... button. To add a widget:
1. Select widget placement in the post (a paragraph, a column or a grid).
2. Click Insert Widget... The button is placed above the editor window:
3. Select widget type from the dropdown list and fill in required fields:
4. Click Insert Widget. The widget will be embedded in the post, but it won't be fully displayed in the editor screen. You will see the "Magento Widget" symbol instead:
However, this widget will be fully rendered on the published page:
Check out this short video of the process: