A new post type, Links has now been introduced! This allows users to share links to blog posts, dashboards, and other meaningful URLs, and link them to entities + use tags to categorize them. See the original issue #334 for more info, and thanks to @scrawfordlk for the implementation (#337)!
Additionally, there is now a catalog processor for these links, which adds the link post URLs related to the entity to be part of the entity's metadata.links array. This is an optional feature and requires installation of the catalog module. For more information, please see https://github.com/drodil/backstage-plugin-qeta/tree/main/plugins/catalog-backend-module-qeta (due to an issue with publishing, the catalog module's first version is 3.36.2)