In Drupal 7, on a content type's "Manage display" tab, it was possible to trim strings to a particular length, by setting the field's format to "Trimmed".
For example, you could trim a long text field to 200 characters for the Teaser mode.
This doesn't seem to be possible in Drupal 8 – I don't have the option to set a custom-field's format to "Trimmed". (The only option available is "Plain text".)
Has the "Trimmed" format indeed been removed for custom fields? If so, is there a way to get it back?