diff --git a/src/Glpi/ContentTemplates/TemplateDocumentation.php b/src/Glpi/ContentTemplates/TemplateDocumentation.php
index f68df134cc2..7e3d10f6d22 100644
--- a/src/Glpi/ContentTemplates/TemplateDocumentation.php
+++ b/src/Glpi/ContentTemplates/TemplateDocumentation.php
@@ -36,7 +36,9 @@
 namespace Glpi\ContentTemplates;
 
 use Glpi\ContentTemplates\Parameters\ParametersTypes\ParameterTypeInterface;
+use Glpi\Plugin\Hooks;
 use Glpi\Toolbox\MarkdownBuilder;
+use Plugin;
 
 /**
  * Class used to build the twig variable documentation for a given set of
@@ -110,6 +112,7 @@ public function addSection(
     ) {
         // Check if this section is already defined, needed as some parameters
         // might have the same references
+        global $PLUGIN_HOOKS;
         if (isset($this->sections[$title])) {
             return;
         }
@@ -131,6 +134,16 @@ public function addSection(
         // Keep track of parameters needing aditionnal references
         $references = [];
 
+        //additional parameters
+        foreach ($PLUGIN_HOOKS[Hooks::GET_CONTENT_TEMPLATE_PARAMETER] as $plugin => $hook_callable) {
+            $plugin_parameters = Plugin::doOneHook($plugin, Hooks::GET_CONTENT_TEMPLATE_PARAMETER, $fields_prefix);
+            if (is_array($plugin_parameters)) {
+                foreach ($plugin_parameters as $plugin_parameter) {
+                    array_push($parameters, $plugin_parameter);
+                }
+            }
+        }
+
         // Add a row for each parameters
         foreach ($parameters as $parameter) {
             /** @var ParameterTypeInterface $parameter */
diff --git a/src/Glpi/ContentTemplates/TemplateManager.php b/src/Glpi/ContentTemplates/TemplateManager.php
index b844a6e95f9..85422ee9c6f 100644
--- a/src/Glpi/ContentTemplates/TemplateManager.php
+++ b/src/Glpi/ContentTemplates/TemplateManager.php
@@ -37,7 +37,9 @@
 
 use CommonITILObject;
 use Glpi\Error\ErrorHandler;
+use Glpi\Plugin\Hooks;
 use Glpi\RichText\RichText;
+use Plugin;
 use Twig\Environment;
 use Twig\Error\Error;
 use Twig\Error\SyntaxError;
@@ -107,14 +109,25 @@ public static function renderContentForCommonITIL(
         CommonITILObject $itil_item,
         string $template
     ): ?string {
+        global $PLUGIN_HOOKS;
         $parameters = $itil_item->getContentTemplatesParametersClassInstance();
 
+        $parameters_value = $parameters->getValues($itil_item);
+        foreach ($PLUGIN_HOOKS[Hooks::GET_CONTENT_TEMPLATE_VALUE] as $plugin => $hook_callable) {
+            $plugin_parameters = Plugin::doOneHook($plugin, Hooks::GET_CONTENT_TEMPLATE_VALUE, ['NodeName' => $parameters->getDefaultNodeName(), 'id' => $itil_item->fields['id']]);
+            if (is_array($plugin_parameters)) {
+                foreach ($plugin_parameters as $key => $value) {
+                    $parameters_value[$key] = $value;
+                }
+            }
+        }
+
         try {
             $html = TemplateManager::render(
                 $template,
                 [
                     'itemtype' => $itil_item->getType(),
-                    $parameters->getDefaultNodeName() => $parameters->getValues($itil_item),
+                    $parameters->getDefaultNodeName() => $parameters_value,
                 ]
             );
         } catch (Error $e) {
diff --git a/src/Glpi/Plugin/Hooks.php b/src/Glpi/Plugin/Hooks.php
index 61f03a14929..b8d29886f38 100644
--- a/src/Glpi/Plugin/Hooks.php
+++ b/src/Glpi/Plugin/Hooks.php
@@ -565,6 +565,20 @@ class Hooks
      */
     public const SHOW_ITEM_STATS           = 'show_item_stats';
 
+    /**
+     * Register a function to display new variables in reply messages.
+     * The function is called with the name of actual item.
+     * The function is expected to return an array with parmeter.
+     */
+    public const GET_CONTENT_TEMPLATE_PARAMETER      = 'get_content_template_parameter';
+
+    /**
+     * Register a function to display new variables in reply messages.
+     * The function is called with type and id of the actuel item.
+     * The function is expected to return an array with parameters values.
+     */
+    public const GET_CONTENT_TEMPLATE_VALUE       = 'get_content_template_value';
+
     /**
      * Register a function to add additional permission restrictions for the item.
      * The function is called with the item as a parameter.
@@ -1408,6 +1422,8 @@ public static function getItemHooks(): array
             self::POST_SHOW_TAB,
             self::POST_PREPAREADD,
             self::SHOW_ITEM_STATS,
+            self::GET_CONTENT_TEMPLATE_PARAMETER,
+            self::GET_CONTENT_TEMPLATE_VALUE,
             self::TIMELINE_ACTIONS,
         ];
     }