Display extra information in the collection contents page

[EweSparky]

I can create a collection with a custom field, but I can't do anything with the data entered into those fields once I add an item to that collection.

It would be great if I could view that data, either when viewing the individual item (perhaps a tab showing collection custom fields), and/or when viewing a collection (perhaps as a row/column adjacent to each item).

I should also be able to search and filter that data like I can any other field.

Finally, it'd be nice to have a list custom field type, where a dynamic drop-down list is used and populated with existing entries. New entries can be added by typing into the field and saving, rather than selecting an existing item. This sort of thing would be useful for where the values can change, but the phrasing is always the same. For example:

collection: Platforms
custom_list_name: platform_name
custom_description: Which platform or service did I buy this on or stream it on?
custom_list_entries: [
  Amazon Prime,
  Apple TV,
  Netflix
]

collection: Recommended
custom_list_name: recommender_name
custom_description: Who recommended it to me?
custom_list_entries: [
  Bob,
  Mary
]

then later on, I might search for a movie available on Shudder recommended by John. I could add the movie to the Platforms collection and type in Shudder for the platform name, and add it to the Recommended collection and type in John for who recommended it to me. If John recommended a second movie available on Shudder some other day, I would be able to select Shudder and John from the respective collections because the drop-down menu of list items looks up all unique values and displays them (alphabetically).

[hockdudu]

Viewing the data is an important feature. Otherwise, one can't do anything with the entered data.

I created a "Notes" collection (like suggested in #762), where there's a text field I can write any notes to an item. But I realized now I can't see the notes anywhere, defeating the purpose of having notes.

[IgnisDa]

I agree. @EweSparky @hockdudu Do you have an example screenshot that I can refer that displays similar data well? I do not have any ideas on how the UI should look like and would love some inspiration.

Also @EweSparky, please create a new issue for the list field collection information type.