In custom details, one detail type is "Codex Reference". In Context V2's update, a similar input type exists, and the ability to filter the selectable codex entries (even if just by type) exists. For example, in the input for a prompt, you can select "Content Selection" and then "Codex Entry," and then select one or more of "Characters," "Lore," "Locations," etc. This then limits the type of codex entries that the user can select.

I would like to propose adding such filtering to the Codex Reference custom detail.