diff --git a/application/Espo/Core/Formula/Functions/ArrayAppendType.php b/application/Espo/Core/Formula/Functions/ArrayAppendType.php
new file mode 100644
index 0000000000..92abef6f75
--- /dev/null
+++ b/application/Espo/Core/Formula/Functions/ArrayAppendType.php
@@ -0,0 +1,66 @@
+<?php
+/************************************************************************
+ * This file is part of EspoCRM.
+ *
+ * EspoCRM – Open Source CRM application.
+ * Copyright (C) 2014-2025 Yurii Kuznietsov, Taras Machyshyn, Oleksii Avramenko
+ * Website: https://www.espocrm.com
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <https://www.gnu.org/licenses/>.
+ *
+ * The interactive user interfaces in modified source and object code versions
+ * of this program must display Appropriate Legal Notices, as required under
+ * Section 5 of the GNU Affero General Public License version 3.
+ *
+ * In accordance with Section 7(b) of the GNU Affero General Public License version 3,
+ * these Appropriate Legal Notices must retain the display of the "EspoCRM" word.
+ ************************************************************************/
+
+namespace Espo\Core\Formula\Functions;
+
+use Espo\Core\Formula\ArgumentList;
+use Espo\Core\Formula\Exceptions\Error;
+
+/**
+ * @noinspection PhpUnused
+ */
+class ArrayAppendType extends BaseFunction
+{
+    public function process(ArgumentList $args)
+    {
+        if (count($args) < 2) {
+            $this->throwTooFewArguments();
+        }
+
+        $name = $this->evaluate($args[0]);
+
+        if (!is_string($name)) {
+            $this->throwBadArgumentValue(1, 'string');
+        }
+
+        $value = $this->evaluate($args[1]);
+
+        if (!property_exists($this->getVariables(), $name)) {
+            throw new Error("Cannot array-append to not existing variable.");
+        }
+
+        $array =& $this->getVariables()->$name;
+
+        if (!is_array($array)) {
+            throw new Error("Cannot array-append to non-array variable.");
+        }
+
+        $array[] = $value;
+    }
+}
diff --git a/application/Espo/Core/Formula/Parser.php b/application/Espo/Core/Formula/Parser.php
index 8ac1bda4f2..484e2f9f9d 100644
--- a/application/Espo/Core/Formula/Parser.php
+++ b/application/Espo/Core/Formula/Parser.php
@@ -108,10 +108,25 @@ class Parser
             if ($firstPart[0] == '$') {
                 $variable = substr($firstPart, 1);
 
+                $isArrayAppend = false;
+
+                if (str_ends_with($firstPart, '[]')) {
+                    $variable = substr($firstPart, 1, -2);
+
+                    $isArrayAppend = true;
+                }
+
                 if ($variable === '' || !preg_match($this->variableNameRegExp, $variable)) {
                     throw new SyntaxError("Bad variable name `$variable`.");
                 }
 
+                if ($isArrayAppend) {
+                    return new Node('arrayAppend', [
+                        new Value($variable),
+                        $this->split($secondPart)
+                    ]);
+                }
+
                 return new Node('assign', [
                     new Value($variable),
                     $this->split($secondPart)
diff --git a/tests/unit/Espo/Core/Formula/EvaluatorTest.php b/tests/unit/Espo/Core/Formula/EvaluatorTest.php
index 5fdb2700cd..eec7b03832 100644
--- a/tests/unit/Espo/Core/Formula/EvaluatorTest.php
+++ b/tests/unit/Espo/Core/Formula/EvaluatorTest.php
@@ -1690,4 +1690,45 @@ class EvaluatorTest extends TestCase
 
         $this->assertEquals(null, $result);
     }
+
+    public function testArrayAppend1(): void
+    {
+        $expression = "
+            \$test = list();
+            \$test[] = 'a';
+            array\\at(\$test, 0);
+        ";
+
+        /** @noinspection PhpUnhandledExceptionInspection */
+        $result = $this->evaluator->process($expression);
+
+        $this->assertEquals('a', $result);
+    }
+
+    public function testArrayAppendError1(): void
+    {
+        $expression = "
+            \$test[] = 'a';
+            array\\at(\$test, 0);
+        ";
+
+        $this->expectException(Error::class);
+
+        /** @noinspection PhpUnhandledExceptionInspection */
+        $this->evaluator->process($expression);
+    }
+
+    public function testArrayAppendError2(): void
+    {
+        $expression = "
+            \$test = '';
+            \$test[] = 'a';
+            array\\at(\$test, 0);
+        ";
+
+        $this->expectException(Error::class);
+
+        /** @noinspection PhpUnhandledExceptionInspection */
+        $this->evaluator->process($expression);
+    }
 }