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This solution is a plugin that allows you to add a widget for writing a short code in it. It’s very simple – install the app and register in it that you want to display.
Shortcode Widget

Shortcode Widget is a widget that complements the functionality of the standard version of the widget WorsPress (something that was missing in the original).
To test it, add it and use the short tag “[shortcode_widget_test]”, it displays an inscription stating that the plugin works on the site, and confirm the correct operation.