Why would you want a (pseudo|extra)field the widget of which is stored in a configuration item? Maybe if you use Config Pages (which in fact are singleton content entities).
To wrap your head around this, start enabling the packaged example feature.
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Project information
Unsupported
Not supported (i.e. abandoned), and no longer being developed. Learn more about dealing with unsupported (abandoned) projectsNo further development
No longer developed by its maintainers.- Created by geek-merlin on , updated
Stable releases for this project are covered by the security advisory policy.
Look for the shield icon below.
Releases
8.x-1.2
released 6 November 2023
Works with Drupal: ^8.7.7 || ^9 || ^10
gitlab testing
Install:
Development version: 8.x-1.x-dev updated 6 Nov 2023 at 17:32 UTC

