Dynamic filter on existing field values

Summary When configuring a Collection Item Dropdown field, i want to configure a filter that uses data from a different field. Basic Example <img width="1684" height="1440" alt="image" src=" /> On my Default Page collection, i have a Dropdown field: 'language' and a Collection Item Dropdown field: 'translation' In the example above, i want to configure the field to select a default page, that is not of the same language. When i try the example in the screenshot, it just queries Motivation I'm doing this for configuring the language switcher on each frontend page. It allows content managers to configure items that can be switched too. The build-in language module doesn't really work for me: Some components have no language, and others must be managed separately. Detailed Design For a User: When configuring a filter for any field interface that allows filtering, a user should be able to provide a value…