diff --git a/src/Plugin/Field/FieldWidget/ParagraphsWidget.php b/src/Plugin/Field/FieldWidget/ParagraphsWidget.php
index 1905b24..3a68896 100644
--- a/src/Plugin/Field/FieldWidget/ParagraphsWidget.php
+++ b/src/Plugin/Field/FieldWidget/ParagraphsWidget.php
@@ -956,6 +956,19 @@ class ParagraphsWidget extends WidgetBase {
       ],
     ];
 
+    // Hidden field provided by "Modal" mode. Field is provided for additional
+    // integrations, where also position of addition can be specified. It should
+    // be used by sub-modules or other paragraphs integration. CSS class is used
+    // to support easier element selecting in JavaScript.
+    $element['add_modal_form_area']['add_more_delta'] = [
+      '#type' => 'hidden',
+      '#attributes' => [
+        'class' => [
+           'paragraph-type-add-modal-delta',
+        ],
+      ],
+    ];
+
     $element['#attached']['library'][] = 'paragraphs/drupal.paragraphs.modal';
     if ($this->isFeatureEnabled('add_above')) {
       $element['#attached']['library'][] = 'paragraphs/drupal.paragraphs.add_above_button';
@@ -1826,7 +1839,7 @@ class ParagraphsWidget extends WidgetBase {
       $field_path = array_merge($submit['element']['#field_parents'], [$submit['element']['#field_name']]);
       $add_more_delta = NestedArray::getValue(
         $submit['element'],
-        ['add_more', 'add_more_delta', '#value']
+        ['add_more', 'add_modal_form_area', 'add_more_delta', '#value']
       );
 
       static::prepareDeltaPosition($submit['widget_state'], $form_state, $field_path, $add_more_delta);