diff --git a/framework/src/Volo.Abp.UI.Navigation/Volo/Abp/Ui/Navigation/ApplicationMenu.cs b/framework/src/Volo.Abp.UI.Navigation/Volo/Abp/Ui/Navigation/ApplicationMenu.cs
index 976552a6ec..1a69de7f2c 100644
--- a/framework/src/Volo.Abp.UI.Navigation/Volo/Abp/Ui/Navigation/ApplicationMenu.cs
+++ b/framework/src/Volo.Abp.UI.Navigation/Volo/Abp/Ui/Navigation/ApplicationMenu.cs
@@ -1,4 +1,6 @@
+using System.Collections.Generic;
 using JetBrains.Annotations;
+using Volo.Abp.Data;
 using Volo.Abp.UI.Navigation;
 
 namespace Volo.Abp.UI.Navigation;
@@ -31,10 +33,9 @@ public class ApplicationMenu : IHasMenuItems
 
     /// <summary>
     /// Can be used to store a custom object related to this menu.
-    /// TODO: Convert to dictionary!
     /// </summary>
-    [CanBeNull]
-    public object CustomData { get; set; }
+    [NotNull]
+    public Dictionary<string, object> CustomData { get; } = new();
 
     public ApplicationMenu(
         [NotNull] string name,
@@ -59,6 +60,16 @@ public class ApplicationMenu : IHasMenuItems
         return this;
     }
 
+    /// <summary>
+    /// Adds a custom data item to <see cref="CustomData"/> with given key &amp; value.
+    /// </summary>
+    /// <returns>This <see cref="ApplicationMenu"/> itself.</returns>
+    public ApplicationMenu WithCustomData(string key, object value)
+    {
+        CustomData[key] = value;
+        return this;
+    }
+
     public override string ToString()
     {
         return $"[ApplicationMenu] Name = {Name}";
diff --git a/framework/src/Volo.Abp.UI.Navigation/Volo/Abp/Ui/Navigation/ApplicationMenuItem.cs b/framework/src/Volo.Abp.UI.Navigation/Volo/Abp/Ui/Navigation/ApplicationMenuItem.cs
index 1f5d26d7bb..32241ba7ac 100644
--- a/framework/src/Volo.Abp.UI.Navigation/Volo/Abp/Ui/Navigation/ApplicationMenuItem.cs
+++ b/framework/src/Volo.Abp.UI.Navigation/Volo/Abp/Ui/Navigation/ApplicationMenuItem.cs
@@ -79,7 +79,8 @@ public class ApplicationMenuItem : IHasMenuItems, IHasSimpleStateCheckers<Applic
     /// <summary>
     /// Can be used to store a custom object related to this menu item. Optional.
     /// </summary>
-    public object CustomData { get; set; }
+    [NotNull]
+    public Dictionary<string, object> CustomData { get; } = new();
 
     /// <summary>
     /// Can be used to render the element with a specific Id for DOM selections.
@@ -97,7 +98,6 @@ public class ApplicationMenuItem : IHasMenuItems, IHasSimpleStateCheckers<Applic
         string url = null,
         string icon = null,
         int order = DefaultOrder,
-        object customData = null,
         string target = null,
         string elementId = null,
         string cssClass = null,
@@ -111,7 +111,6 @@ public class ApplicationMenuItem : IHasMenuItems, IHasSimpleStateCheckers<Applic
         Url = url;
         Icon = icon;
         Order = order;
-        CustomData = customData;
         Target = target;
         ElementId = elementId ?? GetDefaultElementId();
         CssClass = cssClass;
@@ -131,6 +130,16 @@ public class ApplicationMenuItem : IHasMenuItems, IHasSimpleStateCheckers<Applic
         return this;
     }
 
+    /// <summary>
+    /// Adds a custom data item to <see cref="CustomData"/> with given key &amp; value.
+    /// </summary>
+    /// <returns>This <see cref="ApplicationMenuItem"/> itself.</returns>
+    public ApplicationMenuItem WithCustomData(string key, object value)
+    {
+        CustomData[key] = value;
+        return this;
+    }
+
     private string GetDefaultElementId()
     {
         return "MenuItem_" + Name;
diff --git a/modules/cms-kit/src/Volo.CmsKit.Public.Web/Menus/CmsKitPublicMenuContributor.cs b/modules/cms-kit/src/Volo.CmsKit.Public.Web/Menus/CmsKitPublicMenuContributor.cs
index 845db61425..2753816af0 100644
--- a/modules/cms-kit/src/Volo.CmsKit.Public.Web/Menus/CmsKitPublicMenuContributor.cs
+++ b/modules/cms-kit/src/Volo.CmsKit.Public.Web/Menus/CmsKitPublicMenuContributor.cs
@@ -58,7 +58,6 @@ public class CmsKitPublicMenuContributor : IMenuContributor
             menuItem.Url,
             menuItem.Icon,
             menuItem.Order,
-            customData: null,
             menuItem.Target,
             menuItem.ElementId,
             menuItem.CssClass