Missing Schema for source_entity_label.link

Problem/Motivation

With config_inspector, I am getting warnings:

display.page_2.display_options.fields.source_entity_label.link | Undefined | undefined | No | 1 | missing schema | 'link' is not a supported key.

Adding that field to the configuration will include a key for whether it is linked to the entity or not, but that key is not defined in schema.

Steps to reproduce

Create a view of webform submissions, displaying fields, and add a field for for the "Submitted to: Entity Label" entity. Save it. Check config_inspector to see error.

Proposed resolution

Add the schema definition. I tried for a bit to figure out the necessary syntax to do that, but unfortunately did not get very far.