Add %?custom_taxonomy_slug?%

Good morning, on the site https://imporlan.cl I activated the Custom Post Type Permalinks plugin so that the post_type=listings are displayed with a good URL for SEO (eg https://prueba.imporlan.cl/listings/embarcacion/lancha/pesca-recreativa/2010-tracker-grizzly-1754/). However, I would like the post_type=listing to not appear in the URL, something I did with this plugin (simple Post Type Permalink), but which doesn′t have the tag “% custom_taxonomy_slug%”, necessary to present the boat-type of listing.
How could I add that tag in this plugin?

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