Problem:
- I want to render an entity using an entity_reference field formatter. This entity is independent and not a field value, so it doesn't have any parent. I want to give the end user the options of formatters to pick from and be able to fill in options.
- If it helps think of it as you have a file entity and you want to render it using the file_generic formatter.
Context:
- Rendering an entity embedded in filtered text (hence rendering is done in Filter plugins).