Ability to add custom file fields to Node Edit Form

Description of the need

I have added a custom "Credits" field to the file type for images. It is possible to display the Title and Alt Text fields when adding an image through a node edit form with a image field. However, I can't find any way to display the new custom "Credits" field on the node edit form. My client wants credit information attached to all image files, which means that they must take an extra step to edit each file through the manage file interface. This is very incovenient.

Proposed solution

Provide an option to includes custom fields, such as my "Credits" field on any image fields on the node edit form.

Alternatives that have been considered

I'm not sure if this needs to be in core. A contrib module might also be a good option.

Describe alternatives you've considered. Have you seen this work in a better way in another CMS?

Is there a Drupal or Backdrop contributed module that accomplishes this?

Drupal has a File Entity Inline module that might work? https://www.drupal.org/project/file_entity_inline

Now available for BackdropCMS: https://backdropcms.org/project/file_entity_inline

Additional information

See this discussion in the forum: https://forum.backdropcms.org/forum/how-add-field-file-upload-process#co...

Draft of feature description for Press Release (1 paragraph at most)

It is now easier to add images directly to nodes with custom data attached directly to the file entity.