James Wilson
--- a/label_help.module
+++ b/label_help.module
+  }
+}
+
+/**
+ * Submit handler to save label_help_description.
+ */
+function label_help_form_field_config_edit_form_submit($form, FormStateInterface $form_state) {
+  // Check if the field config is being edited.
+  if (isset($form_state->getFormObject()->getEntity()->field_name)) {
+    $field_name = $form_state->getFormObject()->getEntity()->field_name;
+
+    // Get the label_help_description from the submitted form values.
+    $label_help_description = $form_state->getValue(['settings', 'label_help_description']);
+
+    // Set the label_help_description as a third-party setting for the field.
+    field_config('field.storage.node.' . $field_name)
--- a/label_help.module
+++ b/label_help.module
-  $form['#entity_builders'][] = 'label_help_form_field_config_edit_form_builder';
+function label_help_form_field_config_edit_form_alter(&$form, FormStateInterface &$form_state, $form_id) {
+  if (isset($form['#entity_type']) && $form['#entity_type'] == 'field_config') {
+    $fieldConfig = $form_state->getFormObject()->getEntity();
+
+    // Add settings for file upload widgets.
+    $form['settings']['label_help_description'] = [
+      '#type' => 'textarea',
+      '#rows' => 2,
+      '#title' => t('Label help message'),
+      '#default_value' => $fieldConfig->getThirdPartySetting('label_help', 'label_help_description', ''),
+      '#description' => t('Help text to insert below the label and above the input form element.'),
+    ];
+    $form['actions']['submit']['#submit'][] = 'label_help_form_field_config_edit_form_submit';
+  }
+}