Riyas N R
--- a/core/modules/config/src/Form/ConfigSingleImportForm.php
+++ b/core/modules/config/src/Form/ConfigSingleImportForm.php
+   * Handles switching the import textarea.
+   */
+  public function updateImport($form, FormStateInterface $form_state) {
+    // Determine the full config name for the selected config entity.
+    if ($form_state->getValue('config_type') !== 'system.simple') {
+      $definition = $this->entityTypeManager->getDefinition($form_state->getValue('config_type'));
+      $name = $definition->getConfigPrefix() . '.' . $form_state->getValue('config_name');
+    }
+    // The config name is used directly for simple configuration.
+    else {
+      $name = $form_state->getValue('config_name');
+    }
+    /**
+     * @var Drupal\Core\Config\FileStorage
+     */
+    $config_storage_sync_service = \Drupal::service('config.storage.sync');
--- a/core/modules/config/src/Form/ConfigSingleImportForm.php
+++ b/core/modules/config/src/Form/ConfigSingleImportForm.php
+    // Determine the full config name for the selected config entity.
+    if ($form_state->getValue('config_type') !== 'system.simple') {
+      $definition = $this->entityTypeManager->getDefinition($form_state->getValue('config_type'));
+      $name = $definition->getConfigPrefix() . '.' . $form_state->getValue('config_name');
+    }
+    // The config name is used directly for simple configuration.
+    else {
+      $name = $form_state->getValue('config_name');
+    }
+    /**
+     * @var Drupal\Core\Config\FileStorage
+     */
+    $config_storage_sync_service = \Drupal::service('config.storage.sync');
+    // Check if config exists.
+    $exists = $config_storage_sync_service->exists($name);
+    $form['import']['#value'] = !$exists ? NULL : Yaml::encode($config_storage_sync_service->read($name));
--- a/core/modules/config/src/Form/ConfigSingleImportForm.php
+++ b/core/modules/config/src/Form/ConfigSingleImportForm.php
+    if ($form_state->getValue('config_type') !== 'system.simple') {
+      $definition = $this->entityTypeManager->getDefinition($form_state->getValue('config_type'));
+      $name = $definition->getConfigPrefix() . '.' . $form_state->getValue('config_name');
+    }
+    // The config name is used directly for simple configuration.
+    else {
+      $name = $form_state->getValue('config_name');
+    }
+    /**
+     * @var Drupal\Core\Config\FileStorage
+     */
+    $config_storage_sync_service = \Drupal::service('config.storage.sync');
+    // Check if config exists.
+    $exists = $config_storage_sync_service->exists($name);
+    $form['import']['#value'] = !$exists ? NULL : Yaml::encode($config_storage_sync_service->read($name));
+    return $form['import'];
--- a/core/modules/config/src/Form/ConfigSingleImportForm.php
+++ b/core/modules/config/src/Form/ConfigSingleImportForm.php
      '#rows' => 24,
      '#required' => TRUE,
    ];
+    if ($config_type && $config_name) {
+      $fake_form_state = (new FormState())->setValues([
--- a/core/modules/config/src/Form/ConfigSync.php
+++ b/core/modules/config/src/Form/ConfigSync.php
              ]),
            ],
          ];
+          // Get config type from config name.
+          $config_type = $this->configManager->getEntityTypeIdByName($config_name) ?? 'system.simple';
+          // Set config name URL parameter.
+          $config_name_url_param = $config_name;
+
+          // If config type is not empty and is not 'system.simple',
+          // Remove config prefix from config name.
+          if (!empty($config_type) && $config_type != 'system.simple') {
--- a/core/modules/config/src/Form/ConfigSingleImportForm.php
+++ b/core/modules/config/src/Form/ConfigSingleImportForm.php
   * @param \Drupal\Core\Extension\ThemeExtensionList $extension_list_theme
   *   The theme extension list.
   */
-  public function __construct(EntityTypeManagerInterface $entity_type_manager, StorageInterface $config_storage, RendererInterface $renderer, EventDispatcherInterface $event_dispatcher, ConfigManagerInterface $config_manager, LockBackendInterface $lock, TypedConfigManagerInterface $typed_config, ModuleHandlerInterface $module_handler, ModuleInstallerInterface $module_installer, ThemeHandlerInterface $theme_handler, ModuleExtensionList $extension_list_module, ThemeExtensionList $extension_list_theme = NULL) {
+  public function __construct(EntityTypeManagerInterface $entity_type_manager, StorageInterface $config_storage, RendererInterface $renderer, StorageInterface $sync_storage, EventDispatcherInterface $event_dispatcher, ConfigManagerInterface $config_manager, LockBackendInterface $lock, TypedConfigManagerInterface $typed_config, ModuleHandlerInterface $module_handler, ModuleInstallerInterface $module_installer, ThemeHandlerInterface $theme_handler, ModuleExtensionList $extension_list_module, ThemeExtensionList $extension_list_theme = NULL) {
--- a/core/modules/config/src/Form/ConfigSingleImportForm.php
+++ b/core/modules/config/src/Form/ConfigSingleImportForm.php
   */
  protected $data = [];

+  /**
+   * The sync configuration storage.
+   *
+   * @var \Drupal\Core\Config\StorageInterface
+   */
+  protected $syncStorage;
--- a/core/modules/config/src/Form/ConfigSingleImportForm.php
+++ b/core/modules/config/src/Form/ConfigSingleImportForm.php
    return $form;
  }

+  /**
+   * Handles switching the import textarea.
+   */
+  public function updateImport($config_type, $config_name) {