Output some referenced entities in a different view mode

Problem/Motivation

I would like to introduce a setting to let the user choose to output some entities in a different view mode. To make it not overly complicated, I am thinking about having a setting to output the first x items in a different view mode. This will only apply to the rendered entity formatter. It will apply to the final order of entities after the sorting and limiting has been done.

Steps to reproduce

n. a.

Proposed resolution

Add setting to the rendered entity display formatter and change the view mode accordingly before output

Remaining tasks

Create code

User interface changes

New setting

API changes

n. a.

Data model changes

configuration schema will be amended