first commit

vendor/chi-teck/drupal-code-generator/templates/_theme-settings/config.twig

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+# Default settings of {{ name }} theme.
+example: 'foo'

vendor/chi-teck/drupal-code-generator/templates/_theme-settings/form.twig

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+<?php
+
+declare(strict_types=1);
+
+/**
+ * @file
+ * Theme settings form for {{ name }} theme.
+ */
+
+use Drupal\Core\Form\FormState;
+
+/**
+ * Implements hook_form_system_theme_settings_alter().
+ */
+function {{ machine_name }}_form_system_theme_settings_alter(array &$form, FormState $form_state): void {
+
+  $form['{{ machine_name }}'] = [
+    '#type' => 'details',
+    '#title' => t('{{ name }}'),
+    '#open' => TRUE,
+  ];
+
+  $form['{{ machine_name }}']['example'] = [
+    '#type' => 'textfield',
+    '#title' => t('Example'),
+    '#default_value' => theme_get_setting('example'),
+  ];
+
+}

vendor/chi-teck/drupal-code-generator/templates/_theme-settings/schema.twig

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+# Schema for the configuration files of the {{ name }} theme.
+{{ machine_name }}.settings:
+  type: theme_settings
+  label: '{{ name }} settings'
+  mapping:
+    example:
+      type: string
+      label: Example