plugin-8.x-2.8/tests/modules/plugin_test_helper/config/schema/plugin_test_helper.schema.yml

plugin_test_helper.plugin_configuration.plugin_test_helper_mock.*:
  type: ignore

plugin_test_helper.plugin_configuration.plugin_test_helper_mock.plugin_test_helper_configurable_plugin:
  type: mapping
  mapping:
    foo:
      label: A random string
      type: string